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Countries Involved in World War 1 (WWWI)

  • Data are based upon each country's government and borders at the time of WWI, which may differ from their modern incarnations.
  • Participants that have dissolved since WWI, such as the Ottoman Empire, are typically listed under the names of the countries that currently exist in their place.
  • Participants that are not classified as sovereign states by the United Nations, such as the Andaman Islands, may not be listed.
  • Countries are placed into one of three categories based upon their level of involvement in WWI:
  • "Principal" countries were major participants in WWI
  • "Secondary" countries were slightly less impactful than principal combatants but still played important roles in WWI, such as providing supplies, sending large number of troops, or enduring military attack or occupation.
  • "Minor" countries played comparatively small roles in the war, but were still involved in some way, such as providing aid or sending small numbers of troops to serve in a primary participants army.
  • Many countries' alignments shifted over the course of the war. For example, a country that was initially neutral may have been drawn into the fray by invasion from another country, and a country whose government allied with one side could switch allegiances after an internal coup replaced that government with new leadership.
  • Occupied countries present a unique case, as it could be argued they aided their occupiers' efforts, although they did so grudgingly and without choice in the matter.
  • Perhaps surprisingly, sources disagree as to the date upon which WWI ended. Most commemorations mark the ending as 11 November, 1918, the date upon which the Armistice of Compiègne was signed, ending hostilities. However, some memorials maintain that WWI did not truly end until the signing of the Versaille Treaty on 28 June 1919.

214 countries

Country
World War I Alignment
Role/Level of Involvement in WWI
Year Entered WWI
Region
Additional WWI Details
Guatemalanone / AlliesMinor1918North America
Guatemala remained noncommittal through most of WWI. Guatemala's actual participation in WWI was min...
Haitinone / AlliesMinor1918North America
The US sent troops to occupy Haiti starting in July 1915, before the US had even entered the war, in...
Cubanone / AlliesMinor1917North America
Cuba spent much of WWI as a noncommittal (undeclared neutral) country, but officially joined the All...
Hondurasnone / AlliesMinor1918North America
Honduras remained noncommittal through most of WWI. The country's actual participation in WWI was mi...
Nicaraguanone / AlliesMinor1918North America
As with many South American and Central American countries, Nicaragua's actual participation in WWI ...
Costa Ricanone / AlliesMinor1918
Costa Rica severed relations with Germany on Sept. 21, 1917 and declared war on May 23, 1918 (some s...
Panamanone / AlliesMinor1917North America
Panama remained noncommittal through most of WWI, but eventually declared war on Germany on 7 April ...
ColombianonenonenoneSouth America
Although it never formally declared its neutrality, Colombia remained noncommittal throughout WWI.
SudannoneMinor1914Africa
Modern-day Sudan consists largely of portions of regions that were British-controlled Anglo-Egyptian...
PerunoneMinornoneSouth America
Peru's involvement in WWI was minimal, though the country did sever diplomatic relations with the Ce...
ChilenonenonenoneSouth America
Although it never formally declared its neutrality, Chile remained noncommittal throughout WWI.
EcuadornoneMinornoneSouth America
Ecuador's involvement in WWI was minimal. Ecuador maintained a position of unofficial neutrality, th...
BolivianoneMinornoneSouth America
Bolivia's involvement in WWI was minimal, though the country did sever diplomatic relations with the...
South SudannoneMinor1914Africa
Modern-day South Sudan consists largely of portions of regions that were British-controlled Anglo-Eg...
Dominican RepublicnoneMinor1916North America
The Dominican Republic's involvement in WWI was minimal, though the country did sever diplomatic rel...
ParaguaynonenonenoneSouth America
Although it never formally declared its neutrality, Paraguay remained noncommittal throughout WWI.
UruguaynoneMinornoneSouth America
Uruguay's involvement in WWI was minimal, though the country did sever diplomatic relations with the...
MoldovanoneMinor1914Europe
A territory of Russia leading up to World War I, Moldova rebelled during the war and declared indepe...
AlbanianoneSecondary1914Europe
Having just attained its independence in 1912, the Principality of Albania's newly established gover...
BahrainnoneMinornoneAsia
Bahrain was a British protectorate during World War I. However, the Bahraini people were often less ...
United StatesNeutral / AlliesPrincipal1917
The United States initial maintained a stance of neutrality (though US banks had given substantial l...
BrazilNeutral / AlliesMinor1917South America
Mired in internal politics, Brazil remained neutral for much of the war, but joined the Allies in Oc...
PhilippinesNeutral / AlliesMinor1917Asia
The Philippines was a semi-autonomous US colony during WWI, and the 1916 Jones Act (Philippine Auton...
ThailandNeutral / AlliesSecondary1917Asia
Siam (now Thailand) initially declared itself neutral in 1914, but declared war on the Central Power...
ItalyNeutral / AlliesPrincipal1915Europe
At the start of WWI, Italy was part of the Triple Alliance with Germany and Austria-Hungary. Italy i...
BelgiumNeutral / AlliesSecondary1914Europe
Belgium attempted to remain neutral in observance of the 1839 Treaty of London, but was invaded and ...
PortugalNeutral / AlliesSecondary1916Europe
Portugal initially adopted a neutral stance in World War I, but eventually joined the Allies on Marc...
GreeceNeutral / AlliesSecondary1917Europe
Greece initially held a neutral stance during WWI. The Greek Prime Minister supported the Allies, wh...
LuxembourgNeutral / AlliesMinor1914Europe
Declared a neutral nation in the 1867 Treaty of London, Luxembourg attempted to remain neutral durin...
TongaNeutral / AlliesMinor1914Oceania
Tonga initially declared neutrality, as it enjoyed strong relations with both Great Britain (with wh...
IndonesiaNeutralMinornoneAsia
Alternately known as the Dutch East Indies, Indonesia spent WWI as a colony of the Kingdom of the Ne...
EthiopiaNeutralMinornoneAfrica
Alternately known as Abyssinia at the time, Ethiopia never formally declared its neutrality, but spe...
MexicoNeutralnonenoneNorth America
Mexico remained neutral throughout WWI.
SpainNeutralSecondarynoneEurope
Declared neutrality on Aug. 4, 1914. During 1914 Battle of Rio de Oro, Spanish Guinea provided sanct...
ArgentinaNeutralnonenoneSouth America
Argentina remained neutral throughout WWI.
VenezuelaNeutralnonenoneSouth America
Venezuela remained neutral throughout WWI.
NetherlandsNeutralSecondarynoneEurope
Declared neutrality on July 30, 1914. Provided humanitarian aid.
SwedenNeutralSecondary1914Europe
Declared neutrality on Aug. 3, 1914. Provided humanitarian aid.
SwitzerlandNeutralSecondary1914Europe
Declared neutrality on Aug. 2, 1914. Provided humanitarian aid.
El SalvadorNeutralnonenoneNorth America
El Salvador remained neutral throughout World War I.
NorwayNeutralSecondary1914Europe
Declared neutrality on Aug. 4, 1914. Provided humanitarian aid.
Equatorial GuineaNeutralMinornoneAfrica
Equatorial Guinea spent WWI as a colony of Spain, which remained neutral. However, it did provide sa...
Western SaharaNeutralMinornone
At the time of WWI, Rio de Oro/Spanish Sahara was a colony of Spain, which remained neutral during t...
IcelandNeutralMinornoneEurope
Part of the Kingdom of Denmark until 1918; remained neutral.
AndorraNeutralMinornoneEurope
Andorra remained neutral throughout World War I. Reports surfaced in 1958 that the country had decla...
GreenlandNeutralMinornone
Part of the Kingdom of Denmark, which was neutral during the war.
San MarinoNeutralMinornoneEurope
Despite propaganda erroneously articles claiming San Marino had declared war on Austria-Hungary, San...
TanzaniaMixedSecondary1914Africa
Modern Tanzania spent WWI split between Tanganyika (British colony) and German East Africa (German c...
YemenMixedSecondary1914Asia
During WWI, the area that is now Yemen was split. The port city/region of Aden was an important Brit...
PolandMixedSecondary1914Europe
At the time of WWI, modern-day Poland consisted of three territories, ruled by Austria-Hungary, Germ...
UkraineMixedPrincipal1914Europe
Modern-day Ukraine was not a sovereign state at the time of WWI, and instead had territory in both R...
GhanaMixedMinor1914Africa
Modern-day Ghana spent WWI split between the British Gold Coast—a British colony aligned with the Al...
Czech RepublicMixedSecondary1918Europe
The country now known as the Czech Republic was part of Austria-Hungary during WWI, and so aligned w...
TogoMixedSecondary1914Africa
Then known as Togoland, modern Togo began WWI as a protectorate of Germany, which entered the war as...
LibyaMixedSecondary1915Africa
At the time of WWI, modern-day Libya was technically an Italian colony, having been ceded from the O...
SlovakiaMixedPrincipal1914Europe
Slovakia spent WWI as a territory of Austria-Hungary, which triggered WWI with its declaration or wa...
GeorgiaMixedSecondary1914Asia
Modern Georgia began WWI as part of the Russian Empire, a major Allied participant. However, Georgia...
TurkeyCentral PowersSecondary1914Asia
In 1914, modern-day Turkey was the headquarters of the Ottoman Empire/Turkish Empire (Anatolia), a p...
GermanyCentral PowersPrincipal1914Europe
Aligned with Austria-Hungary, Germany was a principal Central Power and declared war against Russia ...
IraqCentral PowersPrincipal1914Asia
In 1914, much of modern-day Iraq was part of the Ottoman Empire/Turkish Empire, a principal Central ...
CameroonCentral PowersSecondary1914Africa
Modern Cameroon was a colony of Germany during WWI and so entered the war by association. Then known...
SyriaCentral PowersPrincipal1914Asia
In 1914, much of modern-day Syria was part of the Ottoman Empire/Turkish Empire (Anatolia), a princi...
RwandaCentral PowersMinor1914Africa
Rwanda (Ruanda/German East Africa) was a colony of Germany, which entered the war as a Central Power...
BurundiCentral PowersMinor1914Africa
Burundi was a German colony (German East Africa) at the start of the war, and so entered the war by ...
JordanCentral PowersPrincipal1914Asia
In 1914, much of modern-day Jordan was part of the Ottoman Empire/Turkish Empire, a principal Centra...
Papua New GuineaCentral PowersMinor1914Oceania
Papua New Guinea began WWI as a colony of Germany, which entered the war on Aug. 1, 1914. Australia ...
HungaryCentral PowersPrincipal1914Europe
Half of the Austro-Hungarian Empire's dual monarchy. Its heir, Archduke Franz Ferdinand, was assassi...
IsraelCentral PowersPrincipal1914Asia
In 1914, modern-day Israel was part of the Ottoman Empire/Turkish Empire (Anatolia), a principal Cen...
AustriaCentral PowersPrincipal1914Europe
Austria was part of Austria-Hungary during WWI. Its heir, Archduke Franz Ferdinand, was assassinated...
BulgariaCentral PowersPrincipal1915Europe
Having established its independence from the Ottoman Empire in 1908, Bulgaria declared entry into th...
LebanonCentral PowersPrincipal1914Asia
In 1914, modern-day Lebanon was a semi-autonomous part of the Ottoman Empire/Turkish Empire, a princ...
CroatiaCentral PowersPrincipal1914Europe
Croatia spent WWI as part of the Triune Kingdom of Croatia, Slavonia and Dalmatia, a territory of Au...
Bosnia and HerzegovinaCentral PowersSecondary1914Europe
Bosnia and Herzegovina was a territory of Austria-Hungary at the start of WWI. The city of Sarajevo ...
NamibiaCentral PowersMinor1914Africa
At the start of WWI, Namibia was colony of Germany, which entered the war on Aug. 1, 1914. Namibia w...
SloveniaCentral PowersPrincipal1914Europe
Slovenia at the time of WWI was a territory of Austria-Hungary, which triggered a series of war decl...
SamoaCentral PowersMinor1914Oceania
Western Samoa was a German colony at the time of the war. It surrendered to New Zealand in August 19...
MicronesiaCentral PowersMinor1914Oceania
A colony of Germany, which entered the war on August 1, 1914; the islands were captured and occupied...
Marshall IslandsCentral PowersMinor1914Oceania
A colony of Germany, which entered the war on August 1, 1914; the islands were captured by Japan in ...
NauruCentral PowersMinor1914Oceania
Nauru was a German colony during WWI. It was captured by Australia in September 1914 and remained oc...
IndiaAlliesSecondary1914Asia
Most of WWI-era India was part of the British Empire, and so entered the war in 1914 alongside Great...
ChinaAlliesMinor1917Asia
China's involvement in World War I was minimal, as the country was consumed by internal political st...
NigeriaAlliesSecondary1914Africa
Nigeria spent WWI as a freshly-minted colony of Great Britain, which declared war on Germany on Augu...
RussiaAlliesPrincipal1914Europe
Aligned with Serbia. Mobilized after Austria-Hungary's declaration of war in July 1914. Dissolved in...
JapanAlliesPrincipal1914Asia
Japan played a significant role in World War I by capturing and occupying many German territories in...
EgyptAlliesSecondary1914Africa
Egypt during WWI was a protectorate of Great Britain, which declared war against Germany on Aug. 4, ...
VietnamAlliesSecondary1914Asia
Often referred to as French Indochina (or just Indochina), Vietnam was administered by New Caledonia...
United KingdomAlliesPrincipal1914Europe
The largest global empire at the time of the war, the United Kingdom declared war against Germany on...
FranceAlliesPrincipal1914Europe
When France, a principal ally, joined the war in 1914, its many colonial territories also joined by ...
South AfricaAlliesSecondary1914Africa
A self-governing dominion of the British Empire at the time of WWI, South Africa played a major role...
KenyaAlliesSecondary1914Africa
Most of modern-day Kenya's territory was located in British East Africa (also known as the East Afri...
MyanmarAlliesSecondary1914
Then known as Burma, modern-day Myanmar spent WWI as a territory of the British Raj (a colony of Gre...
UgandaAlliesMinor1914Africa
A protectorate of Great Britain, which entered in the war in August 1914; Ugandan soldiers served in...
AlgeriaAlliesSecondary1914Africa
Part of French empire 1830-1951. Algerian soldiers fought in the French army. Nearly 60% of North Af...
CanadaAlliesSecondary1914North America
Due to its ties to the British government, Canada joined the war automatically alongside Great Brita...
MoroccoAlliesMinor1914Africa
At the time of WWI, Morocco was split between French (Allies) Morocco and Spanish (Neutral) Morocco....
AngolaAlliesSecondary1914Africa
A colony of Portugal, Angola began fighting off a German invasion in December 1914, nearly two years...
MalaysiaAlliesSecondary1914Asia
Malaysia was a British colony during WWI, and so joined the war by association alongside Great Brita...
MozambiqueAlliesSecondary1916Africa
Mozambique spent WWI as a colony (Portuguese East Africa) of Portugal, which officially entered the ...
Saudi ArabiaAlliesSecondary1915Asia
Aided by France and Great Britain, the Saudis rebelled against the occupying Ottoman Empire, which w...
MadagascarAlliesSecondary1914Africa
Madagascar spent WWI as a colony of France, which entered the war in 1914. At least 41,355 individua...
Ivory CoastAlliesSecondary1914Africa
At the time of WWI, Ivory Coast was part of French West Africa, a colony of France, which entered th...
NigerAlliesSecondary1914Africa
A colony of France, which entered the war in August 1914
AustraliaAlliesSecondary1914Oceania
MaliAlliesMinor1914Africa
Modern-day Mali was a colony of France during WWI, so it joined the war by association. Recruits fro...
Burkina FasoAlliesMinor1914Africa
Modern-day Burkina Faso was a colony of France during WWI, so it joined the war by association. Recr...
MalawiAlliesSecondary1914Africa
Malawi, then known alternately as Nyasaland, spent WWI as a colony of Great Britain, which declared ...
ZambiaAlliesSecondary1914Africa
Then known as Northern Rhodesia, modern-day Zambia was a colony of Great Britain during WWI and a si...
ChadAlliesSecondary1914Africa
Modern Chad was a French colony (part of French Equatorial Africa) during WWI, and so joined the war...
RomaniaAlliesSecondary1916Europe
Approximately three years after the end of the Second Balkan War, in which it fought against Bulgari...
SomaliaAlliesMinor1914Africa
Somalia was divided into British Somaliland (British colony), Italian Somaliland (Italian colony) an...
SenegalAlliesSecondary1914Africa
A colony of France, which entered the war in August 1914. At least 181,512 Senegalese are known to h...
CambodiaAlliesSecondary1914Asia
Modern-day Cambodia (often referred to at the time as Indochina / French Indochina) was a French col...
ZimbabweAlliesSecondary1914Africa
A colony of Great Britain during WWI, modern Zimbabwe was then known as Southern Rhodesia. Nearly 40...
GuineaAlliesSecondary1914Africa
Modern-day Guinea was a French colony during WWI. It joined the war by association alongside France ...
BeninAlliesSecondary1914Africa
Benin was a colony of France during WWI (part of French Dahomey / French West Africa) and so joined ...
TunisiaAlliesMinor1914Africa
Tunisia was a colony of France, which entered the war in August 1914.
AzerbaijanAlliesSecondary1914Asia
Modern Azerbaijan began WWI as part of the Russian Empire, a Principal Allied participant. However, ...
BelarusAlliesPrincipal1914Europe
Belarus began WWI as a territory of Russia, but spent large portions of the war occupied by Germany....
Sierra LeoneAlliesMinor1914Africa
A colony of Great Britain, which declared war on Germany on August 4, 1914
LaosAlliesSecondary1914Asia
Part of Indochina/French Indochina, modern Laos was a colony of France during WWI, and entered the w...
SerbiaAlliesPrincipal1914Europe
After diplomacy failed to resolve the conflict following the assassination of the Austro-Hungarian h...
Republic of the CongoAlliesSecondary1914
A colony of France, which entered the war in August 1914.
SingaporeAlliesMinor1914Asia
Singapore was part of the British colony the Straits Settlements during World War I, and so joined t...
FinlandAlliesSecondary1914Europe
The Grand Duchy of Finland was a territory of the Russian Empire from the start of the war until the...
LiberiaAlliesMinor1917Africa
Neutral for the first few years, then declared war against Germany on Aug. 4, 1917. Liberian troops ...
Central African RepublicAlliesSecondary1914Africa
The modern Central African Republic was a French colony (part of French Equatorial Africa) during WW...
IrelandAlliesPrincipal1914
At the time of WWI, Ireland was a territory of mainland Great Britain, which declared war against Ge...
New ZealandAlliesSecondary1914Oceania
A colony of Great Britain, which declared war on Germany on August 4, 1914. New Zealand supplied 100...
MauritaniaAlliesMinor1914Africa
Part of French Empire, which entered the war in August 1914.
KuwaitAlliesMinor1914Asia
Kuwait was in the process of separating from the Ottoman Empire when WWI broke out. When British for...
EritreaAlliesSecondary1915Africa
A colony of Italy during WWI, Eritrea sent thousands of troops (called "askaris") to fight on the fr...
ArmeniaAlliesSecondary1914Asia
Modern Armenia was located largely within the Russian Empire at the time of WWI, and an estimated 15...
LithuaniaAlliesPrincipal1914Europe
Lithuania spent WWI as a territory of Russia, which entered the war in July 1914. However, it was oc...
JamaicaAlliesSecondary1914North America
Jamaica was a British colony at the time of WWI, and so joined the war by association along with Gre...
GambiaAlliesSecondary1914Africa
Modern-day Gambia was a British West African colony during WWI. It joined the war by association alo...
GabonAlliesSecondary1914Africa
A colony of France, which entered the war in August 1914. Gabon was part of French Equatorial Africa...
BotswanaAlliesSecondary1914Africa
Modern-day Botswana was a colony (Bechuanaland) of Great Britain during WWI, so it joined the war by...
LesothoAlliesMinor1914Africa
Then known as Basutoland, modern Laos was a British colony of France during WWI, and entered the war...
Guinea BissauAlliesMinor1916Africa
Guinea-Bissau spent WWI as a colony of Portugal, which officially entered the war on March 9, 1916 i...
LatviaAlliesPrincipal1914Europe
Modern-day Latvia was part of the Russian Empire at the time of WWI, and so entered the war in July ...
North MacedoniaAlliesSecondary1914Europe
North Macedonia during WWI was a territory of Serbia, which entered the war on July 28, 1914 after A...
Trinidad and TobagoAlliesMinor1914North America
Trinidad was a British colony at the time of WWI, and so joined the war by association along with Gr...
Timor LesteAlliesSecondary1916Asia
 A colony of Portugal, which officially entered the war on March 9, 1916 after Germany's declaration...
EstoniaAlliesPrincipal1914Europe
Estonia was a territory of Russia, which entered the war in July 1914. Approximately 100,000 Estonia...
CyprusAlliesSecondary1914Europe
Modern-day Cyprus was a British colony (British Cyprus) during WWI. It joined the war by association...
MauritiusAlliesMinor1914Africa
A colony of Great Britain, which declared war on Germany on August 4, 1914
EswatiniAlliesSecondary1914Africa
Known as Swaziland, Eswatini was a British colony during WWI. It joined the war by association along...
DjiboutiAlliesMinor1914Africa
Known as French Somaliland during WWI, Djibouti was part of the French Empire and so joined the war ...
ReunionAlliesMinor1914
Reunion spent WWI as part of French Madagascar, a colony of France, which entered the war in August ...
ComorosAlliesSecondary1914Africa
Comoros was part of Madagascar, which in turn was a colony of France during WWI, and so entered the ...
GuyanaAlliesMinor1914South America
Guyana was the colony British Guiana at the time of WWI, and so joined the war by association along ...
MontenegroAlliesSecondary1914Europe
Declared war against Germany on Aug. 11, 1914. Montenegro was occupied by Austria-Hungary throughout...
MaltaAlliesSecondary1914Europe
Malta spent WWI as a British colony, and so joined the war by default alongside Great Britain in 191...
MaldivesAlliesminor1914Asia
A protectorate of Great Britain, which declared war on Germany on August 4, 1914. The Maldives' role...
Cape VerdeAlliesSecondary1916
Modern-day Cape Verde was a Portuguese colony during WWI, so it joined the war by association alongs...
BelizeAlliesSecondary1914North America
Modern-day Belize was the colony British Honduras at the time of WWI, and so joined the war by assoc...
BahamasAlliesMinor1914North America
The Commonwealth of The Bahamas was a British colony during WWI and so became involved by associatio...
GuadeloupeAlliesMinor1914
A colony of France, which entered the war in August 1914. Guadeloupe's participation in the war was ...
MartiniqueAlliesMinor1914
A colony of France, which entered the war in August 1914. Martinique's participation in the war was ...
VanuatuAlliesMinor1914Oceania
Known as the New Hebrides Condominium during WWI, the country now known as Vanuatu was administered ...
MayotteAlliesMinor1914
Part of Madagascar, a colony of France, which entered the war in August 1914
French GuianaAlliesMinor1914
Although part of the French Empire during WWI, French Guiana was largely a penal colony at the time ...
New CaledoniaAlliesSecondary1914
A colony of France; men of fighting age from the island's indigenous population, the Kanaks, were co...
BarbadosAlliesMinor1914North America
Barbados was a British colony during WWI and so became involved by association. Barbadians served vo...
Sao Tome and PrincipeAlliesSecondary1916
São Tomé and Principe spent WWI as a colony of Portugal, which officially entered the war on March 9...
Saint LuciaAlliesMinor1914North America
Saint Lucia was a British colony at the time of WWI, and so joined the war by association along with...
KiribatiAlliesMinor1914Oceania
At the time of WWI, Kiribati was part of the Gilbert and Ellice Islands, a colony of Great Britain, ...
SeychellesAlliesMinor1914Africa
A colony of Great Britain, which declared war on Germany on August 4, 1914
GrenadaAlliesMinor1914North America
Grenada was a British colony during WWI, and so entered the war by association. It helped supply fun...
Isle of ManAlliesSecondary1914
A British Crown dependency. During the war, over 82% of its men of fighting age enlisted in the Brit...
GibraltarAlliesMinor1914
Gibraltar was a colony of Great Britain, which declared war against Germany on August 4, 1914, durin...
Saint MartinAlliesMinor1914
A colony of France, which entered the war in August 1914
Cook IslandsAlliesMinor1914
The Cook Islands were a colony of Great Britain, which declared war on Germany on Aug. 4, 1914, duri...
Wallis and FutunaAlliesMinor1914
A colony of France, which entered the war in August 1914
Saint BarthelemyAlliesMinor1914
A colony of France, which entered the war in August 1914
TuvaluAlliesMinor1914Oceania
At the time of WWI, Kiribati was part of the Gilbert and Ellice Islands, a colony of Great Britain, ...
Saint Pierre and MiquelonAlliesMinor1914
A colony of France, which entered the war in August 1914
Falkland IslandsAlliesMinor1914
A colony of Great Britain, which declared war on Germany on August 4, 1914; site of the Battle of th...
TokelauAlliesMinor1914
A colony of Great Britain, which entered the war in August 1914; awarded to New Zealand in the Treat...
PakistanAsia
BangladeshAsia
DR CongoAfrica
IranAsia
South KoreaAsia
AfghanistanAsia
UzbekistanAsia
NepalAsia
North KoreaAsia
TaiwanAsia
Sri LankaAsia
KazakhstanAsia
United Arab EmiratesAsia
TajikistanAsia
TurkmenistanAsia
Hong KongAsia
KyrgyzstanAsia
DenmarkEurope
OmanAsia
MongoliaAsia
QatarAsia
FijiOceania
Solomon IslandsOceania
BhutanAsia
MacauAsia
SurinameSouth America
BruneiAsia
Saint Vincent and the GrenadinesNorth America
Antigua and BarbudaNorth America
DominicaNorth America
Saint Kitts and NevisNorth America
LiechtensteinEurope
MonacoEurope
PalauOceania
Vatican CityEurope

Which countries were involved in World War 1?

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.

How many countries were involved in World War 1?

Approximately 30 nations and colonies were involved in the conflict.

Frequently Asked Questions

Sources