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The countries involved in or affected by World War II are listed alphabetically, with a description of their role in the conflict: Participants/Non-Participants During WW2 Neutral Powers
- Overview
- The outbreak of war
World War II began in Europe on September 1, 1939, when Germany invaded Poland. Great Britain and France responded by declaring war on Germany on September 3. The war between the U.S.S.R. and Germany began on June 22, 1941, with Operation Barbarossa, the German invasion of the Soviet Union. The war in the Pacific began on December 7/8, 1941, when Japan attacked the American naval base at Pearl Harbor and other American, Dutch, and British military installations throughout Asia.
Read more below: Axis initiative and Allied reaction: The outbreak of war
Pacific War
Read more about the war in the Pacific.
What countries fought in World War II?
The main combatants were the Axis powers (Germany, Italy, and Japan) and the Allies (France, Great Britain, the United States, the Soviet Union, and, to a lesser extent, China).
By the early part of 1939 the German dictator Adolf Hitler had become determined to invade and occupy Poland. Poland, for its part, had guarantees of French and British military support should it be attacked by Germany. Hitler intended to invade Poland anyway, but first he had to neutralize the possibility that the Soviet Union would resist the invasion of its western neighbour. Secret negotiations led on August 23–24 to the signing of the German-Soviet Nonaggression Pact in Moscow. In a secret protocol of this pact, the Germans and the Soviets agreed that Poland should be divided between them, with the western third of the country going to Germany and the eastern two-thirds being taken over by the U.S.S.R.
Britannica Quiz
Pop Quiz: 17 Things to Know About World War II
Having achieved this cynical agreement, the other provisions of which stupefied Europe even without divulgence of the secret protocol, Hitler thought that Germany could attack Poland with no danger of Soviet or British intervention and gave orders for the invasion to start on August 26. News of the signing, on August 25, of a formal treaty of mutual assistance between Great Britain and Poland (to supersede a previous though temporary agreement) caused him to postpone the start of hostilities for a few days. He was still determined, however, to ignore the diplomatic efforts of the western powers to restrain him. Finally, at 12:40 pm on August 31, 1939, Hitler ordered hostilities against Poland to start at 4:45 the next morning. The invasion began as ordered. In response, Great Britain and France declared war on Germany on September 3, at 11:00 am and at 5:00 pm, respectively. World War II had begun.
Countries Involved in World War Two (WWII) 2024. While a surprising number of countries are currently at war, all of today's conflicts combined would still be far smaller than World War II. Involving more than 100 million people from dozens of nations (many more than in World War I) spread all across the globe, WWII was the biggest war in human ...
CountryAxis Or AlliesWwii Time LineAdditional DetailsAxisJune 1940 - September 8, 1943.Originally one of the major Axis powers, ...AxisNovember 23, 1940 - August 23, 1944Originally an Axis power, Romania ...AxisNovember 20, 1940 - March 1944In March 1944, Germany forced Hungary to ...AxisMarch 1, 1941 - September 8, 1944Bulgaria was part of the Axis powers from ...World War II [b] or the Second World War (1 September 1939 – 2 September 1945) was a global conflict between two major alliances: the Allies and the Axis powers. The vast majority of the world's countries, including all the great powers, fought as part of these military alliances.
- Allied victory
29 de oct. de 2009 · World War II, the largest and deadliest conflict in human history, involved more than 50 nations and was fought on land, sea and air in nearly every part of the world. Also known as the Second...
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World War II, or Second World War, (1939–45) International conflict principally between the Axis powers —Germany, Italy, and Japan—and the Allied powers—France, Britain, the U.S., the Soviet Union, and China.
5 de oct. de 2021 · World War II was a conflict that involved virtually every part of the world during 1939–45. The main combatants were the Axis powers (Germany, Italy, and Japan) and the Allies (France, Great Britain, the United States, the Soviet Union, and China). It was the bloodiest conflict, as well as the largest war, in human history.
