Answer:
The event that brought the United States into World War 2 is pearl harbor, where the japanese bombed pearl harbor in Hawaii. Japan had killed 2,403 Americans. Pearl harbor made the Americans go to war with Japan and its allies in Europe.
Explanation:
They crossed the Atlantic Ocean.
One of the major long term effects of the War of 1812 was that, although it technically ended in a stand-off between America and Britain, it greatly boosted the confidence and nationalist sentiment of Americans, since it proved once again that they could fight of a major world power.
