Why did many Americans support isolationism?

Many Americans supported isolationism because the rise of dictatorships and militarism in Europe made their sacrifices during World War I seem pointless. ... President Roosevelt supports internationalism because he believed that trade between nations creates prosperity and helps prevent war.

Explanation:

(202 bc - 220 ad) dynasty started by lui bang; a great and long-lasting rule, it discarded the harsh policies of the qin dynasty and adopted confucian principles; han rulers chose officials who passed the civil service exams rather than birth; it was a time of prosperity