Because the United States of America are brave and needed to help our allies win this war or Hitler, Hirohito, and Mussiloni would gain too much power over our allies.
The US was attacked.
Mormons and religious issues running up against the US government.
If i understand on what you mean then the Jews
The US did enter World War 1, though not till 1917.
the sinking of the Lusitania.
The religious wackaloons may try to take several states out of the Union.
the reason was the Germans did not leave Poland so they had to declare war on Germany otherwise the Germans would attack us and take over us.
what was one of the reason why the us has been so reluctant to intervene in world war 2
M1 Garand & Nukes
They got involed in the war because the Japanese bombed pearl harbour.
The reason the US entered war world 2 was that Japan had destroyed the USA's base at Pearl Harbor in Hawaii.
The sinking of the Lusitania was a big one.