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World War I (abbreviated WWI or WW1) was a global war that was started in Europe on July 28, 1914. This war lasted for over four years, finally coming to an end on November 11, 1918. This war was not only long, but it was also one of the largest wars in history. Over 70 million military personnel were mobilized, including 60 million Europeans. This war was also very deadly, resulting in the death of approximately 9 million servicemen and 7 million civilians.
The first event that led to the war was the assassination of Archduke Franz Ferdinand by Gavrilo Princip. Following the assassination, Serbia and Austria-Hungary went to war. The war grew as a result of interlocking alliances. Europe was divided into two coalitions: the Triple Alliance and the Triple Entente. Then, a domino effect began. Russia was ready to defend Serbia, its ally. Then, Germany declared war on Russia in order to protect Austria. France in turn declared war on Germany to protect Russia. Then, Britain declared war on Germany after the Germans invaded Belgium. On one side, the countries that were involved in this war included Austria-Hungary, Bulgaria, Germany, and the Ottoman Empire. Fighting against them was France, Great Britain, italy, Japan, Romania, Russia, and the United States. The war finally came to an end in 1917 with the signing of the Treaty of Versailles.
Country | World War I Alignment | Role/Level of Involvement in WWI | Year Entered WWI | Region | Additional WWI Details |
---|---|---|---|---|---|
Guatemala | none / Allies | Minor | 1918 | North America | Guatemala remained noncommittal through most of WWI. Guatemala's actual participation in WWI was min... |
Haiti | none / Allies | Minor | 1918 | North America | The US sent troops to occupy Haiti starting in July 1915, before the US had even entered the war, in... |
Cuba | none / Allies | Minor | 1917 | North America | Cuba spent much of WWI as a noncommittal (undeclared neutral) country, but officially joined the All... |
Honduras | none / Allies | Minor | 1918 | North America | Honduras remained noncommittal through most of WWI. The country's actual participation in WWI was mi... |
Nicaragua | none / Allies | Minor | 1918 | North America | As with many South American and Central American countries, Nicaragua's actual participation in WWI ... |
Costa Rica | none / Allies | Minor | 1918 | Costa Rica severed relations with Germany on Sept. 21, 1917 and declared war on May 23, 1918 (some s... | |
Panama | none / Allies | Minor | 1917 | North America | Panama remained noncommittal through most of WWI, but eventually declared war on Germany on 7 April ... |
Colombia | none | none | none | South America | Although it never formally declared its neutrality, Colombia remained noncommittal throughout WWI. |
Sudan | none | Minor | 1914 | Africa | Modern-day Sudan consists largely of portions of regions that were British-controlled Anglo-Egyptian... |
Peru | none | Minor | none | South America | Peru's involvement in WWI was minimal, though the country did sever diplomatic relations with the Ce... |
Chile | none | none | none | South America | Although it never formally declared its neutrality, Chile remained noncommittal throughout WWI. |
Ecuador | none | Minor | none | South America | Ecuador's involvement in WWI was minimal. Ecuador maintained a position of unofficial neutrality, th... |
Bolivia | none | Minor | none | South America | Bolivia's involvement in WWI was minimal, though the country did sever diplomatic relations with the... |
South Sudan | none | Minor | 1914 | Africa | Modern-day South Sudan consists largely of portions of regions that were British-controlled Anglo-Eg... |
Dominican Republic | none | Minor | 1916 | North America | The Dominican Republic's involvement in WWI was minimal, though the country did sever diplomatic rel... |
Paraguay | none | none | none | South America | Although it never formally declared its neutrality, Paraguay remained noncommittal throughout WWI. |
Uruguay | none | Minor | none | South America | Uruguay's involvement in WWI was minimal, though the country did sever diplomatic relations with the... |
Moldova | none | Minor | 1914 | Europe | A territory of Russia leading up to World War I, Moldova rebelled during the war and declared indepe... |
Albania | none | Secondary | 1914 | Europe | Having just attained its independence in 1912, the Principality of Albania's newly established gover... |
Bahrain | none | Minor | none | Asia | Bahrain was a British protectorate during World War I. However, the Bahraini people were often less ... |
United States | Neutral / Allies | Principal | 1917 | The United States initial maintained a stance of neutrality (though US banks had given substantial l... | |
Brazil | Neutral / Allies | Minor | 1917 | South America | Mired in internal politics, Brazil remained neutral for much of the war, but joined the Allies in Oc... |
Philippines | Neutral / Allies | Minor | 1917 | Asia | The Philippines was a semi-autonomous US colony during WWI, and the 1916 Jones Act (Philippine Auton... |
Thailand | Neutral / Allies | Secondary | 1917 | Asia | Siam (now Thailand) initially declared itself neutral in 1914, but declared war on the Central Power... |
Italy | Neutral / Allies | Principal | 1915 | Europe | At the start of WWI, Italy was part of the Triple Alliance with Germany and Austria-Hungary. Italy i... |
Belgium | Neutral / Allies | Secondary | 1914 | Europe | Belgium attempted to remain neutral in observance of the 1839 Treaty of London, but was invaded and ... |
Portugal | Neutral / Allies | Secondary | 1916 | Europe | Portugal initially adopted a neutral stance in World War I, but eventually joined the Allies on Marc... |
Greece | Neutral / Allies | Secondary | 1917 | Europe | Greece initially held a neutral stance during WWI. The Greek Prime Minister supported the Allies, wh... |
Luxembourg | Neutral / Allies | Minor | 1914 | Europe | Declared a neutral nation in the 1867 Treaty of London, Luxembourg attempted to remain neutral durin... |
Tonga | Neutral / Allies | Minor | 1914 | Oceania | Tonga initially declared neutrality, as it enjoyed strong relations with both Great Britain (with wh... |
Indonesia | Neutral | Minor | none | Asia | Alternately known as the Dutch East Indies, Indonesia spent WWI as a colony of the Kingdom of the Ne... |
Ethiopia | Neutral | Minor | none | Africa | Alternately known as Abyssinia at the time, Ethiopia never formally declared its neutrality, but spe... |
Mexico | Neutral | none | none | North America | Mexico remained neutral throughout WWI. |
Spain | Neutral | Secondary | none | Europe | Declared neutrality on Aug. 4, 1914. During 1914 Battle of Rio de Oro, Spanish Guinea provided sanct... |
Argentina | Neutral | none | none | South America | Argentina remained neutral throughout WWI. |
Venezuela | Neutral | none | none | South America | Venezuela remained neutral throughout WWI. |
Netherlands | Neutral | Secondary | none | Europe | Declared neutrality on July 30, 1914. Provided humanitarian aid. |
Sweden | Neutral | Secondary | 1914 | Europe | Declared neutrality on Aug. 3, 1914. Provided humanitarian aid. |
Switzerland | Neutral | Secondary | 1914 | Europe | Declared neutrality on Aug. 2, 1914. Provided humanitarian aid. |
El Salvador | Neutral | none | none | North America | El Salvador remained neutral throughout World War I. |
Norway | Neutral | Secondary | 1914 | Europe | Declared neutrality on Aug. 4, 1914. Provided humanitarian aid. |
Equatorial Guinea | Neutral | Minor | none | Africa | Equatorial Guinea spent WWI as a colony of Spain, which remained neutral. However, it did provide sa... |
Western Sahara | Neutral | Minor | none | At the time of WWI, Rio de Oro/Spanish Sahara was a colony of Spain, which remained neutral during t... | |
Iceland | Neutral | Minor | none | Europe | Part of the Kingdom of Denmark until 1918; remained neutral. |
Andorra | Neutral | Minor | none | Europe | Andorra remained neutral throughout World War I. Reports surfaced in 1958 that the country had decla... |
Greenland | Neutral | Minor | none | Part of the Kingdom of Denmark, which was neutral during the war. | |
San Marino | Neutral | Minor | none | Europe | Despite propaganda erroneously articles claiming San Marino had declared war on Austria-Hungary, San... |
Tanzania | Mixed | Secondary | 1914 | Africa | Modern Tanzania spent WWI split between Tanganyika (British colony) and German East Africa (German c... |
Yemen | Mixed | Secondary | 1914 | Asia | During WWI, the area that is now Yemen was split. The port city/region of Aden was an important Brit... |
Poland | Mixed | Secondary | 1914 | Europe | At the time of WWI, modern-day Poland consisted of three territories, ruled by Austria-Hungary, Germ... |
Ukraine | Mixed | Principal | 1914 | Europe | Modern-day Ukraine was not a sovereign state at the time of WWI, and instead had territory in both R... |
Ghana | Mixed | Minor | 1914 | Africa | Modern-day Ghana spent WWI split between the British Gold Coast—a British colony aligned with the Al... |
Czech Republic | Mixed | Secondary | 1918 | Europe | The country now known as the Czech Republic was part of Austria-Hungary during WWI, and so aligned w... |
Togo | Mixed | Secondary | 1914 | Africa | Then known as Togoland, modern Togo began WWI as a protectorate of Germany, which entered the war as... |
Libya | Mixed | Secondary | 1915 | Africa | At the time of WWI, modern-day Libya was technically an Italian colony, having been ceded from the O... |
Slovakia | Mixed | Principal | 1914 | Europe | Slovakia spent WWI as a territory of Austria-Hungary, which triggered WWI with its declaration or wa... |
Georgia | Mixed | Secondary | 1914 | Asia | Modern Georgia began WWI as part of the Russian Empire, a major Allied participant. However, Georgia... |
Turkey | Central Powers | Secondary | 1914 | Asia | In 1914, modern-day Turkey was the headquarters of the Ottoman Empire/Turkish Empire (Anatolia), a p... |
Germany | Central Powers | Principal | 1914 | Europe | Aligned with Austria-Hungary, Germany was a principal Central Power and declared war against Russia ... |
Iraq | Central Powers | Principal | 1914 | Asia | In 1914, much of modern-day Iraq was part of the Ottoman Empire/Turkish Empire, a principal Central ... |
Cameroon | Central Powers | Secondary | 1914 | Africa | Modern Cameroon was a colony of Germany during WWI and so entered the war by association. Then known... |
Syria | Central Powers | Principal | 1914 | Asia | In 1914, much of modern-day Syria was part of the Ottoman Empire/Turkish Empire (Anatolia), a princi... |
Rwanda | Central Powers | Minor | 1914 | Africa | Rwanda (Ruanda/German East Africa) was a colony of Germany, which entered the war as a Central Power... |
Burundi | Central Powers | Minor | 1914 | Africa | Burundi was a German colony (German East Africa) at the start of the war, and so entered the war by ... |
Jordan | Central Powers | Principal | 1914 | Asia | In 1914, much of modern-day Jordan was part of the Ottoman Empire/Turkish Empire, a principal Centra... |
Papua New Guinea | Central Powers | Minor | 1914 | Oceania | Papua New Guinea began WWI as a colony of Germany, which entered the war on Aug. 1, 1914. Australia ... |
Hungary | Central Powers | Principal | 1914 | Europe | Half of the Austro-Hungarian Empire's dual monarchy. Its heir, Archduke Franz Ferdinand, was assassi... |
Israel | Central Powers | Principal | 1914 | Asia | In 1914, modern-day Israel was part of the Ottoman Empire/Turkish Empire (Anatolia), a principal Cen... |
Austria | Central Powers | Principal | 1914 | Europe | Austria was part of Austria-Hungary during WWI. Its heir, Archduke Franz Ferdinand, was assassinated... |
Bulgaria | Central Powers | Principal | 1915 | Europe | Having established its independence from the Ottoman Empire in 1908, Bulgaria declared entry into th... |
Lebanon | Central Powers | Principal | 1914 | Asia | In 1914, modern-day Lebanon was a semi-autonomous part of the Ottoman Empire/Turkish Empire, a princ... |
Croatia | Central Powers | Principal | 1914 | Europe | Croatia spent WWI as part of the Triune Kingdom of Croatia, Slavonia and Dalmatia, a territory of Au... |
Bosnia and Herzegovina | Central Powers | Secondary | 1914 | Europe | Bosnia and Herzegovina was a territory of Austria-Hungary at the start of WWI. The city of Sarajevo ... |
Namibia | Central Powers | Minor | 1914 | Africa | At the start of WWI, Namibia was colony of Germany, which entered the war on Aug. 1, 1914. Namibia w... |
Slovenia | Central Powers | Principal | 1914 | Europe | Slovenia at the time of WWI was a territory of Austria-Hungary, which triggered a series of war decl... |
Samoa | Central Powers | Minor | 1914 | Oceania | Western Samoa was a German colony at the time of the war. It surrendered to New Zealand in August 19... |
Micronesia | Central Powers | Minor | 1914 | Oceania | A colony of Germany, which entered the war on August 1, 1914; the islands were captured and occupied... |
Marshall Islands | Central Powers | Minor | 1914 | Oceania | A colony of Germany, which entered the war on August 1, 1914; the islands were captured by Japan in ... |
Nauru | Central Powers | Minor | 1914 | Oceania | Nauru was a German colony during WWI. It was captured by Australia in September 1914 and remained oc... |
India | Allies | Secondary | 1914 | Asia | Most of WWI-era India was part of the British Empire, and so entered the war in 1914 alongside Great... |
China | Allies | Minor | 1917 | Asia | China's involvement in World War I was minimal, as the country was consumed by internal political st... |
Nigeria | Allies | Secondary | 1914 | Africa | Nigeria spent WWI as a freshly-minted colony of Great Britain, which declared war on Germany on Augu... |
Russia | Allies | Principal | 1914 | Europe | Aligned with Serbia. Mobilized after Austria-Hungary's declaration of war in July 1914. Dissolved in... |
Japan | Allies | Principal | 1914 | Asia | Japan played a significant role in World War I by capturing and occupying many German territories in... |
Egypt | Allies | Secondary | 1914 | Africa | Egypt during WWI was a protectorate of Great Britain, which declared war against Germany on Aug. 4, ... |
Vietnam | Allies | Secondary | 1914 | Asia | Often referred to as French Indochina (or just Indochina), Vietnam was administered by New Caledonia... |
United Kingdom | Allies | Principal | 1914 | Europe | The largest global empire at the time of the war, the United Kingdom declared war against Germany on... |
France | Allies | Principal | 1914 | Europe | When France, a principal ally, joined the war in 1914, its many colonial territories also joined by ... |
South Africa | Allies | Secondary | 1914 | Africa | A self-governing dominion of the British Empire at the time of WWI, South Africa played a major role... |
Kenya | Allies | Secondary | 1914 | Africa | Most of modern-day Kenya's territory was located in British East Africa (also known as the East Afri... |
Myanmar | Allies | Secondary | 1914 | Then known as Burma, modern-day Myanmar spent WWI as a territory of the British Raj (a colony of Gre... | |
Uganda | Allies | Minor | 1914 | Africa | A protectorate of Great Britain, which entered in the war in August 1914; Ugandan soldiers served in... |
Algeria | Allies | Secondary | 1914 | Africa | Part of French empire 1830-1951. Algerian soldiers fought in the French army. Nearly 60% of North Af... |
Canada | Allies | Secondary | 1914 | North America | Due to its ties to the British government, Canada joined the war automatically alongside Great Brita... |
Morocco | Allies | Minor | 1914 | Africa | At the time of WWI, Morocco was split between French (Allies) Morocco and Spanish (Neutral) Morocco.... |
Angola | Allies | Secondary | 1914 | Africa | A colony of Portugal, Angola began fighting off a German invasion in December 1914, nearly two years... |
Malaysia | Allies | Secondary | 1914 | Asia | Malaysia was a British colony during WWI, and so joined the war by association alongside Great Brita... |
Mozambique | Allies | Secondary | 1916 | Africa | Mozambique spent WWI as a colony (Portuguese East Africa) of Portugal, which officially entered the ... |
Saudi Arabia | Allies | Secondary | 1915 | Asia | Aided by France and Great Britain, the Saudis rebelled against the occupying Ottoman Empire, which w... |
Madagascar | Allies | Secondary | 1914 | Africa | Madagascar spent WWI as a colony of France, which entered the war in 1914. At least 41,355 individua... |
Ivory Coast | Allies | Secondary | 1914 | Africa | At the time of WWI, Ivory Coast was part of French West Africa, a colony of France, which entered th... |
Niger | Allies | Secondary | 1914 | Africa | A colony of France, which entered the war in August 1914 |
Australia | Allies | Secondary | 1914 | Oceania | |
Mali | Allies | Minor | 1914 | Africa | Modern-day Mali was a colony of France during WWI, so it joined the war by association. Recruits fro... |
Burkina Faso | Allies | Minor | 1914 | Africa | Modern-day Burkina Faso was a colony of France during WWI, so it joined the war by association. Recr... |
Malawi | Allies | Secondary | 1914 | Africa | Malawi, then known alternately as Nyasaland, spent WWI as a colony of Great Britain, which declared ... |
Zambia | Allies | Secondary | 1914 | Africa | Then known as Northern Rhodesia, modern-day Zambia was a colony of Great Britain during WWI and a si... |
Chad | Allies | Secondary | 1914 | Africa | Modern Chad was a French colony (part of French Equatorial Africa) during WWI, and so joined the war... |
Romania | Allies | Secondary | 1916 | Europe | Approximately three years after the end of the Second Balkan War, in which it fought against Bulgari... |
Somalia | Allies | Minor | 1914 | Africa | Somalia was divided into British Somaliland (British colony), Italian Somaliland (Italian colony) an... |
Senegal | Allies | Secondary | 1914 | Africa | A colony of France, which entered the war in August 1914. At least 181,512 Senegalese are known to h... |
Cambodia | Allies | Secondary | 1914 | Asia | Modern-day Cambodia (often referred to at the time as Indochina / French Indochina) was a French col... |
Zimbabwe | Allies | Secondary | 1914 | Africa | A colony of Great Britain during WWI, modern Zimbabwe was then known as Southern Rhodesia. Nearly 40... |
Guinea | Allies | Secondary | 1914 | Africa | Modern-day Guinea was a French colony during WWI. It joined the war by association alongside France ... |
Benin | Allies | Secondary | 1914 | Africa | Benin was a colony of France during WWI (part of French Dahomey / French West Africa) and so joined ... |
Tunisia | Allies | Minor | 1914 | Africa | Tunisia was a colony of France, which entered the war in August 1914. |
Azerbaijan | Allies | Secondary | 1914 | Asia | Modern Azerbaijan began WWI as part of the Russian Empire, a Principal Allied participant. However, ... |
Belarus | Allies | Principal | 1914 | Europe | Belarus began WWI as a territory of Russia, but spent large portions of the war occupied by Germany.... |
Sierra Leone | Allies | Minor | 1914 | Africa | A colony of Great Britain, which declared war on Germany on August 4, 1914 |
Laos | Allies | Secondary | 1914 | Asia | Part of Indochina/French Indochina, modern Laos was a colony of France during WWI, and entered the w... |
Serbia | Allies | Principal | 1914 | Europe | After diplomacy failed to resolve the conflict following the assassination of the Austro-Hungarian h... |
Republic of the Congo | Allies | Secondary | 1914 | A colony of France, which entered the war in August 1914. | |
Singapore | Allies | Minor | 1914 | Asia | Singapore was part of the British colony the Straits Settlements during World War I, and so joined t... |
Finland | Allies | Secondary | 1914 | Europe | The Grand Duchy of Finland was a territory of the Russian Empire from the start of the war until the... |
Liberia | Allies | Minor | 1917 | Africa | Neutral for the first few years, then declared war against Germany on Aug. 4, 1917. Liberian troops ... |
Central African Republic | Allies | Secondary | 1914 | Africa | The modern Central African Republic was a French colony (part of French Equatorial Africa) during WW... |
Ireland | Allies | Principal | 1914 | At the time of WWI, Ireland was a territory of mainland Great Britain, which declared war against Ge... | |
New Zealand | Allies | Secondary | 1914 | Oceania | A colony of Great Britain, which declared war on Germany on August 4, 1914. New Zealand supplied 100... |
Mauritania | Allies | Minor | 1914 | Africa | Part of French Empire, which entered the war in August 1914. |
Kuwait | Allies | Minor | 1914 | Asia | Kuwait was in the process of separating from the Ottoman Empire when WWI broke out. When British for... |
Eritrea | Allies | Secondary | 1915 | Africa | A colony of Italy during WWI, Eritrea sent thousands of troops (called "askaris") to fight on the fr... |
Armenia | Allies | Secondary | 1914 | Asia | Modern Armenia was located largely within the Russian Empire at the time of WWI, and an estimated 15... |
Lithuania | Allies | Principal | 1914 | Europe | Lithuania spent WWI as a territory of Russia, which entered the war in July 1914. However, it was oc... |
Jamaica | Allies | Secondary | 1914 | North America | Jamaica was a British colony at the time of WWI, and so joined the war by association along with Gre... |
Gambia | Allies | Secondary | 1914 | Africa | Modern-day Gambia was a British West African colony during WWI. It joined the war by association alo... |
Gabon | Allies | Secondary | 1914 | Africa | A colony of France, which entered the war in August 1914. Gabon was part of French Equatorial Africa... |
Botswana | Allies | Secondary | 1914 | Africa | Modern-day Botswana was a colony (Bechuanaland) of Great Britain during WWI, so it joined the war by... |
Lesotho | Allies | Minor | 1914 | Africa | Then known as Basutoland, modern Laos was a British colony of France during WWI, and entered the war... |
Guinea Bissau | Allies | Minor | 1916 | Africa | Guinea-Bissau spent WWI as a colony of Portugal, which officially entered the war on March 9, 1916 i... |
Latvia | Allies | Principal | 1914 | Europe | Modern-day Latvia was part of the Russian Empire at the time of WWI, and so entered the war in July ... |
North Macedonia | Allies | Secondary | 1914 | Europe | North Macedonia during WWI was a territory of Serbia, which entered the war on July 28, 1914 after A... |
Trinidad and Tobago | Allies | Minor | 1914 | North America | Trinidad was a British colony at the time of WWI, and so joined the war by association along with Gr... |
Timor Leste | Allies | Secondary | 1916 | Asia | A colony of Portugal, which officially entered the war on March 9, 1916 after Germany's declaration... |
Estonia | Allies | Principal | 1914 | Europe | Estonia was a territory of Russia, which entered the war in July 1914. Approximately 100,000 Estonia... |
Cyprus | Allies | Secondary | 1914 | Europe | Modern-day Cyprus was a British colony (British Cyprus) during WWI. It joined the war by association... |
Mauritius | Allies | Minor | 1914 | Africa | A colony of Great Britain, which declared war on Germany on August 4, 1914 |
Eswatini | Allies | Secondary | 1914 | Africa | Known as Swaziland, Eswatini was a British colony during WWI. It joined the war by association along... |
Djibouti | Allies | Minor | 1914 | Africa | Known as French Somaliland during WWI, Djibouti was part of the French Empire and so joined the war ... |
Reunion | Allies | Minor | 1914 | Reunion spent WWI as part of French Madagascar, a colony of France, which entered the war in August ... | |
Comoros | Allies | Secondary | 1914 | Africa | Comoros was part of Madagascar, which in turn was a colony of France during WWI, and so entered the ... |
Guyana | Allies | Minor | 1914 | South America | Guyana was the colony British Guiana at the time of WWI, and so joined the war by association along ... |
Montenegro | Allies | Secondary | 1914 | Europe | Declared war against Germany on Aug. 11, 1914. Montenegro was occupied by Austria-Hungary throughout... |
Malta | Allies | Secondary | 1914 | Europe | Malta spent WWI as a British colony, and so joined the war by default alongside Great Britain in 191... |
Maldives | Allies | minor | 1914 | Asia | A protectorate of Great Britain, which declared war on Germany on August 4, 1914. The Maldives' role... |
Cape Verde | Allies | Secondary | 1916 | Modern-day Cape Verde was a Portuguese colony during WWI, so it joined the war by association alongs... | |
Belize | Allies | Secondary | 1914 | North America | Modern-day Belize was the colony British Honduras at the time of WWI, and so joined the war by assoc... |
Bahamas | Allies | Minor | 1914 | North America | The Commonwealth of The Bahamas was a British colony during WWI and so became involved by associatio... |
Guadeloupe | Allies | Minor | 1914 | A colony of France, which entered the war in August 1914. Guadeloupe's participation in the war was ... | |
Martinique | Allies | Minor | 1914 | A colony of France, which entered the war in August 1914. Martinique's participation in the war was ... | |
Vanuatu | Allies | Minor | 1914 | Oceania | Known as the New Hebrides Condominium during WWI, the country now known as Vanuatu was administered ... |
Mayotte | Allies | Minor | 1914 | Part of Madagascar, a colony of France, which entered the war in August 1914 | |
French Guiana | Allies | Minor | 1914 | Although part of the French Empire during WWI, French Guiana was largely a penal colony at the time ... | |
New Caledonia | Allies | Secondary | 1914 | A colony of France; men of fighting age from the island's indigenous population, the Kanaks, were co... | |
Barbados | Allies | Minor | 1914 | North America | Barbados was a British colony during WWI and so became involved by association. Barbadians served vo... |
Sao Tome and Principe | Allies | Secondary | 1916 | São Tomé and Principe spent WWI as a colony of Portugal, which officially entered the war on March 9... | |
Saint Lucia | Allies | Minor | 1914 | North America | Saint Lucia was a British colony at the time of WWI, and so joined the war by association along with... |
Kiribati | Allies | Minor | 1914 | Oceania | At the time of WWI, Kiribati was part of the Gilbert and Ellice Islands, a colony of Great Britain, ... |
Seychelles | Allies | Minor | 1914 | Africa | A colony of Great Britain, which declared war on Germany on August 4, 1914 |
Grenada | Allies | Minor | 1914 | North America | Grenada was a British colony during WWI, and so entered the war by association. It helped supply fun... |
Isle of Man | Allies | Secondary | 1914 | A British Crown dependency. During the war, over 82% of its men of fighting age enlisted in the Brit... | |
Gibraltar | Allies | Minor | 1914 | Gibraltar was a colony of Great Britain, which declared war against Germany on August 4, 1914, durin... | |
Saint Martin | Allies | Minor | 1914 | A colony of France, which entered the war in August 1914 | |
Cook Islands | Allies | Minor | 1914 | The Cook Islands were a colony of Great Britain, which declared war on Germany on Aug. 4, 1914, duri... | |
Wallis and Futuna | Allies | Minor | 1914 | A colony of France, which entered the war in August 1914 | |
Saint Barthelemy | Allies | Minor | 1914 | A colony of France, which entered the war in August 1914 | |
Tuvalu | Allies | Minor | 1914 | Oceania | At the time of WWI, Kiribati was part of the Gilbert and Ellice Islands, a colony of Great Britain, ... |
Saint Pierre and Miquelon | Allies | Minor | 1914 | A colony of France, which entered the war in August 1914 | |
Falkland Islands | Allies | Minor | 1914 | A colony of Great Britain, which declared war on Germany on August 4, 1914; site of the Battle of th... | |
Tokelau | Allies | Minor | 1914 | A colony of Great Britain, which entered the war in August 1914; awarded to New Zealand in the Treat... | |
Pakistan | Asia | ||||
Bangladesh | Asia | ||||
DR Congo | Africa | ||||
Iran | Asia | ||||
South Korea | Asia | ||||
Afghanistan | Asia | ||||
Uzbekistan | Asia | ||||
Nepal | Asia | ||||
North Korea | Asia | ||||
Taiwan | Asia | ||||
Sri Lanka | Asia | ||||
Kazakhstan | Asia | ||||
United Arab Emirates | Asia | ||||
Tajikistan | Asia | ||||
Turkmenistan | Asia | ||||
Hong Kong | Asia | ||||
Kyrgyzstan | Asia | ||||
Denmark | Europe | ||||
Oman | Asia | ||||
Mongolia | Asia | ||||
Qatar | Asia | ||||
Fiji | Oceania | ||||
Solomon Islands | Oceania | ||||
Bhutan | Asia | ||||
Macau | Asia | ||||
Suriname | South America | ||||
Brunei | Asia | ||||
Saint Vincent and the Grenadines | North America | ||||
Antigua and Barbuda | North America | ||||
Dominica | North America | ||||
Saint Kitts and Nevis | North America | ||||
Liechtenstein | Europe | ||||
Monaco | Europe | ||||
Palau | Oceania | ||||
Vatican City | Europe |
Austria-Hungary, Bulgaria, Germany, and the Ottoman Empire fought against France, Great Britain, Italy, Japan, Romania, Russia, Serbia, Belgium, and the United States in World War I, which began in 1914.
Approximately 30 nations and colonies were involved in the conflict.