Why did the XYZ Affair anger Americans?

Because

Explanation:  It angered the American people and many Europeans, especially the French. French leaders were offended because Britain was allowed to trade with the US, and they were not.

disease was the number one killer of native peoples. they had had little exposure to the diseases of europe. this led to some villages being almost completely wiped out and some tribes destroyed.

on april 6, 1917, the u.s. joined its allies--britain, france, and russia--to fight in world war i. under the command of major general john j. pershing, more than 2 million u.s. soldiers fought on battlefields in france.