context: The Qin (秦, 221 B.C.E.-B. 206 B.C.E.B.) The predecessor was the Countess of Qin, now located in Shaanxi Province, and its national name originated from the land of Qin, the initial center. The national power was rapidly strengthened in the 4th century B.C.E. by reforms by the lawyers of Sangang during the nationwide era. In the middle and third half of the 3rd century BC, the Qin dynasty, including the weak state of the country, destroyed all of Chilung nationwide and achieved reunification.
question: When did Jin-na collapse?
answers.text: 206 B.C