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When did each country join World War 2?


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Answered 2008-07-29 20:06:01

One has to define the beginning of WW2. Several regional conflicts existed through the 1930s. Italy's campaign in Ethiopia and Japan's undeclared war against China for instance. The usually accepted date that WW2 commenced is 1 September 1939 when Germany attacked Poland. Britain and France declared war on Germany on 3 September and at the same so did the constituent members of the British Commonwealth. Other European counties, later members of the Allies, entered the war only when attacked by the Axis. The US only entered the war after the Pearl Harbour attack at the end of 1941, as did US client states such as Mexico and Cuba. As the war swung to the advantage of the Allies, even fence sitting countries or those friendly to Germany and Japan eventually joined the allied cause--Argentina for example declared war on Germany in March 1945 and Chile in April 1945 three weeks before the war had ended.

As the war progressed some countries changed sides. Finland, Hungary and Bulgaria were initially Axis but switched 1n 1944 when German a defeat was inevitable.

Many people whose countries were nominally neutral joined the forces of various countries. Hundreds of thousands of Irish fought mainly in the British forces. After the fall of France, many Frenchmen joined the Free French forces and some joined the Nazi SS as did citizens of Latvia, Lithuania, Estonia and some Balkan countries. Many Palestinian Jews joined the British forces and others mounted terror campaigns against British troops.

Small numbers of US volunteers fought in Allied units before the US entry into WW2, most notable were the Eagle squadrons of the RAF and the Flying Tigers in China.

The full list of countries is too extensive to list here, but the main countries, their date of entry and which side are here.

1 September 1939

Germany (including Austria) Axis

Slovakia (German puppet regime) Axis

Poland Allied

3 September 1939 All Allied

United Kingdom

Imperial possessions (includes India (modern Pakistan and Bangladesh), Ceylon, Burma, Rhodesia, Kenya, Tanganikya, Caribbean possessions, Malaya etc.


New Zealand


During September 1939 All Allied


South Africa



Czech Government in exile ( Czechoslovakia had been absorbed by Germany in Jan 1939)

April 1940 (After being invaded by Germany)



May 1940 (After being invaded by Germany)

The Netherlands



June 1940

Italy Axis

Oct 1940 ( After being invaded by Italy)

Greece Allied

April 1941 ( After being invaded by Germany, Bulgaria and Hungary)

Yugoslavia Allied

April 1941 All Axis




Croatia ( German puppet state)

Iraq ( government overthrown by British forces in 1941, thereafter Allied)


June 1941 (After being attacked by Germany)

USSR Allied

Mongolia (USSR puppet state)

December 1941

USA ( After being attacked by Japan) Allied

China ( Had already been at war with Japan since 1937) Allied

Japan Axis

Korea (Japanese colony) Axis


Brazil Allied

Thailand Axis


Related Questions

Americans felt that if they join the war they would be fighting for their country. many felt an obligation to join, or they were forced by drafts

people wanted to help their country fight for their freedom

Because Ireland was and still is a neutral country.

The role of men in World War II, was to join the military and defend their country and the freedoms provided by their country.

Lots of people join World War 1 as most of them where Patriotic, which meant that if they died in a co use of a war (that they are fighting, in the honour of their country), they would be happy to do it for their nation. Also government did put up advertisements taht would persuade them to join the army.

montenegro never joined by itself, it joined with their country Yugoslavia.

No, Chile was the last nation to join. They joined on April 11th, 1945.

The British army join world war 2 by their expirence.

You didn't join. Or you faught in the war, but U didn't.......

yea evryone wanted the world war 1 just because of 1 murder

Quebec had bloody recations when Canada join the firt world war. Quebec had bloody recations when Canada join the firt world war. Quebec had bloody recations when Canada join the firt world war.

he joined the war because he wanted to be in a free country and he was trying to help everyone else who wanted to be free.

Yes. In fact, Japan was among the first few nations to join the war. The country sided with the Allied Forces.

You can join the war, become a police officer, or join the olympics.

Lloyd may wood staley join world war 1 in 1914

It is not true. Neutrality, as pertains to war, means that a country is choosing not to participate in the war. They are choosing not to join any side and want to be left alone. Sometimes a neutral country does choose a side- like Italy during World War I (they had chosen not to join the Central Powers, and then were basically bribed by the Allies to join their side), or Belgium during both World Wars (both times they were invaded by Germany, despite being neutral). But when this happens, the country ceases to be neutral.

if you mean what country had the first war, that is not possible, humans have been fighting each other since time began, if you mean when was the first world war, that was started by Germany in 1914.

America decided originally not to get involved in World War 2 because of the toll World War 1 took on the country and because the state of the economy. However, with the bombing of pearl harbor, America decided to join the War, which eventually pulled the country out of it's economic depression.

what threat encouraged the United States to join the allies in world war 1

Russia joined world war 1 in 1914

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