Why did the US enter World War II Brainly?
When Japan extended its support to Hitler and bombed the US base at Pearl Harbor, the US entered the Second World War. The war ended in May 1945 with Hitler's defeat and the US dropping of the atom bomb on Hiroshima in Japan.
During World War II, the United States began to provide significant military supplies and other assistance to the Allies in September 1940, even though the United States did not enter the war until December 1941.
December 7, 1941: A Day That Will Live in Infamy
America's isolation from war ended on December 7, 1941, when Japan staged a surprise attack on American military installations in the Pacific. The most devastating strike came at Pearl Harbor, the Hawaiian naval base where much of the US Pacific Fleet was moored.
The U.S. entered WWII because the Japanese bombed U.S. battleships and airplanes at Pearl Harbor, Hawaii. The U.S. declared war on the Axis powers on December 7, 1941.
The Japanese attack on Pearl Harbor on December 7, 1941, ended the debate over American intervention in both the Pacific and European theaters of World War II. The day after the attack, Congress declared war on Imperial Japan with only a single dissenting vote.
On December 7, 1941, following the Japanese bombing of Pearl Harbor, the United States declared war on Japan. Three days later, after Germany and Italy declared war on it, the United States became fully engaged in the Second World War.
Why did the US enter the Second World War? The United States entered the second World War following the unprovoked attack on Pearl Harbor by Japan on 7 December 1941.
On April 2, President Wilson asked Congress to declare war against Germany specifically citing Germany's renewed submarine policy as “a war against mankind. It is a war against all nations.” He also spoke about German spying inside the U.S. and the treachery of the Zimmermann Telegram.
- The Lusitania. In early 1915, Germany introduced a policy of unrestricted submarine warfare in the Atlantic. ...
- The German invasion of Belgium. ...
- American loans. ...
- The reintroduction of unrestricted submarine warfare. ...
- The Zimmerman telegram.
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).
When did the United States enter World War I?
In early April 1917, with the toll in sunken U.S. merchant ships and civilian casualties rising, Wilson asked Congress for “a war to end all wars” that would “make the world safe for democracy.” A hundred years ago, on April 6, 1917, Congress thus voted to declare war on Germany, joining the bloody battle—then ...
World War II was a conflict between 1939 and 1945 that involved all the world's major countries. It was the most destructive war in history and millions of people were killed. It was fought between the Axis (Germany, Japan, and Italy) and the Allies (Britain, the US, and the Soviet Union among others).

Why did the US enter the Second World War? The United States entered the second World War following the unprovoked attack on Pearl Harbor by Japan on 7 December 1941.
The last country to join the Allied Powers (France, UK, USA, and Soviet Union)was Italy in October 1943. Italy had actually been a member of the Axis Powers (along with Germany and Japan) prior to this.
The most important factor in swaying the Soviets eventually to enter into an alliance with the United States was the Nazi decision to launch its invasion of the Soviet Union in June 1941.
On September 3, 1939, in response to Hitler's invasion of Poland, Britain and France, both allies of the overrun nation declare war on Germany.