What caused the US to join WW2?
What happened when the US joined into WW2?

World War II (1939-1945) was the largest armed conflict in human history. ... Although the war began with Nazi Germany's attack on Poland in September 1939, the United States did not enter the war until after the Japanese bombed the American fleet in Pearl Harbor, Hawaii, on December 7, 1941.

Explanation:

The bombing of Pearl Harbor, Hawaii

Explanation:

the main inference that can be drawn from jean jacques rousseau's book the social contract is: a. people can enjoy civil and physical freedom, even if it sometimes harms society.

b) the confederacy had to pay all union war expenses.