What event happened after the qin dynasty collapsed? a) lu bang abandoned legalism. b) wu di appointed his grandson emperor. c) a civil war broke out. d)the great wall was completed.

After the Qin Dynasty collapsed, a civil war broke out. There were quite a few powers within the Dynasty itself, and the leaders of each separated power wanted control of the nation, so they fought against each other since there wasn't exactly a balanced force that could resolve & dispute territorial matters.