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To what end? The US gained no territories as a result of the First World War.
The US and the Allies won the war and the US gained control of the Philippines, causing it to become a world power.
The nuclear weapons that the super power countries had caused international tensions after World War 2. This caused the Cold war between the US and Russia.
because the U.S was gay
Gremany
It was important in that it provided a massive new pool of manpower to a war torn Europe.
because the U.S was gay
Exrtra canon fodder, the allies could now out die the Germans, simple.
If you are referring to World War 2, the Japanese attack on the US base at Pearl Harbour on 7 December 1941 brought the US into the conflict.
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 ship lusitania:)