The Japanese attacked Pearl Harbor December 7, 1941.
The attack on Pearl Harbor
Because this was the main reason for the US entry in WW2, and the American entry in the war was significant for the course and outcome, it affected the entire world.
World War I had 4 long-term causes and one immediate cause. The assassination of the Austro-Hungarian archduke was the immediate cause, the reason war was justified enough to actually begin. The other four are the MAIN causes of the war, Miliatariam, Alliances, Imperialism and Nationalism.
The Franco-Prussian War was not directly related to the entry of the US into World War I.
Maybe you haven't heard of the Japanese attack on Pearl Harbour on 7 December 1941.
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.
world 2 war
do you mean what caused us entry into world war one? if so then the sinking of the USS Lusitania by German u-boats was what caused American entry into the war
Japan bombed the US Naval Fleet in Pearl Harbor, Hawaii on December 7th, 1941. This caused the US to declare war on Japan the next day. This officially put the US into World War 2. The day after that, the United States declared war on Germany.
Officially, the assasination of the heir to the Austrian-Hungary throne. But the European countries had been preparing for the war for a long time already, so this was not the real reason. The assasination was the "immediate trigger", then.
Japanese attack at Pearl Harbour. That's World War 2. The United States entered World War I after the Zimmermann note, which offered German aid for a Mexican invasion of the US, was intercepted, translated and sent to Woodrow Wilson by the British.
the entry of US troops.