Answer:
He led a peasant rebellion that defeated the Qin.
Step-by-step explanation:
Before leading the rebellion, Liu Bang Spent significant years of his life working a minor law enforcement officer for the Qin empire. After the First emperor of Qin died, the empire turned into chaos due to the conflicts that the nobled had among them regarding who should take the power. The peasants were the ones that felt the most negative impacts from these conflicts.
Because of this, he dedicated himself and created a rebellion group consisted of peasants who felt sick and tired about the incompetence of the Qin's nobles. He manage to win the position of Qin's ruler in 206 BCE.