San Antonio (/ˌsæn ænˈtoʊnioʊ/ SAN an-TOH-nee-oh; Spanish for "Saint Anthony"), officially the City of San Antonio, is a city in Texas, United States. The city is the seventh-most populous in the United States, the second-largest in the Southern United States, and the second-most populous in Texas. It is the 12th most-populous city in North America, with 1,434,625 residents in 2020.
Founded as a Spanish mission and colonial outpost in 1718, the city in 1731 became the first chartered civil settlement in what is now present-day Texas. The area was then part of the Spanish Empire. From 1821 to 1836, it was part of the Mexican Republic. It is the oldest municipality in Texas, having celebrated its 300th anniversary on May 1, 2018.
Zichang City, which is directly under the jurisdiction of Shaanxi Province and managed by Yan'an City, is located in the middle of the Loess Plateau, Hengshan District to the north, Zizhou County and Qingjian County to the east, Yanchuan County and Yanan County to the south, Ansai District and Jingbian County to the west, between longitude 109o1158 "- 110o0120022" east and latitude 36 °593030 "- 37 °300000N, with a total area of 2405 square kilometers. The county seat is 93 kilometers away from Yan'an and 430 kilometers away from the provincial capital Xi'an. In 31 (1942), in memory of the national hero Xie Zichang, he changed his name to Zichang County, the hometown of Xie Zichang, the foothold of the long March of the Central Red Army and the starting place of the Anti-Japanese Eastern Expedition. The late agrarian revolution was the seat of the CPC Central Committee and the Chinese Soviet government, and after the founding of the people's Republic of China.