 Complete the following phrase:  In antiquity, Sichuan was the home of the ancient states of Ba and Shu. Their conquest by Qin strengthened it and paved the way for the Qin Shi Huangs unification of China under the Qin dynasty. During the Three Kingdoms era, Liu Beis Shu was based in Sichuan. The area was devastated in the 17th century by Zhang Xianzhongs rebellion and the areas subsequent Manchu conquest, but recovered to become one of Chinas most productive areas by the 19th century. During World War II, Chongqing served as the temporary capital of the Republic of China, making it the focus of 