An Alliance System was a group of nations and/or people that worked together to achieve a certain goal. In WW1, an Alliance System was a group of nations and/or people that worked together to attack an enemy nation.
It was the worst economic downturn in the history of the industrialized world. lasting from 1929 to 1939. It began after the stock market crash of October 1929, which sent Wall Street into panic and wiped out millions of investors.
Pearl Harbor was attacked by Japan on December 7, 1941. <span />
