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In World War II the chief Allied powers were Great Britain, France (except during the German occupation, 1940–44), the Soviet Union (after its entry in June 1941), the United States (after its entry on December 8, 1941), and China.
The attack on Pearl Harbor
See link below on the development of the United Nations in 1945 after the war.
The allied powers in both World War I and World War II were the Soviet union, the United States, the United Kingdom, China, the Nationalists and the Communists.
Great Britain, or more correctly The United Kingdom of Great Britain and Northern Ireland, was involved in both World War 1 and World War 2.
1) they responded by sinking the Zimmerman ship. And that ship was the Germans.
To delay the United States' participation into World War 1, giving Germany better chances to win the conflict. The proposal was intercepted by British forces however, and relayed to the United States. It hastened America's entry into WW1, eventually resulting in Germany losing the war.
The sinking of the Lucitania
The largest factor was Germany's program of unrestricted submarine warfare; even attacking neutral ships in British waters, resulting in the deaths of many Americans.
They were invented and introduced just prior to the United States entry into world war two.
America was a late and reluctant entrant into the Great War. It was thrust into WW-II by the Japanese attack on Pearl Harbor.
The attack on Pearl Harbor was the factor that made the United States decide to enter the war.
They supported the war effort and joined the military in large numbers
The immediate cause of American entry into World War 1 was the German submarine warfare that targeted American ships. In addition, the interception and publication of the infamous Zimmermann Telegram, in which Germany proposed a military alliance with Mexico against the United States, further pushed the U.S. to join the war. American entry ultimately tipped the balance in favor of the Allies and led to their victory. Additionally, it accelerated social and political changes in the United States, as well as increased American influence on the world stage.
The Japanese attack on Pearl Harbour 7 December 1941.
The Franco-Prussian War was not directly related to the entry of the US into World War I.
it wasnt changed