The American ship the Lusitania was sunk by a German U boat.
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.
The Franco-Prussian War was not directly related to the entry of the US into World War I.
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
The sinking of the Lusitania took place in May 1915; the U.S. entered World War 1 in April 1917. It's a mystery to me that people say it was a cause of the U.S. going to war. Obviously, it turned public opinion in the U.S. against Germany.
The Archduke Franz-Ferdinand. He was shot and killed by Gavrilo Princip in Sarajevo, Bosnia. This is immediate cause of the First World War.
The attack on Pearl Harbor
The Germans had been slowly building up their military after the fall of the Weimar Republic; their invasion of Poland in 1939 was probably the most immediate cause of the world war.
the Zimmermann note
The German invasion of Poland in 1939.
The immediate cause of the first revolution in March 1917 was the disastrous impact of the First World War.
The Japanese attacked Pearl Harbor December 7, 1941.
One of the cause of America entry into World War One was the announcement by Germany that there was unrestricted submarine warfare. The effect of America's entry is that it sped the end of the war.
Economic gain.
The assassination of Archduke Franz Ferdinand.
That was the Archduke Franz Ferdinand.
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.
russia dropped out the war