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.
Chengxian, which belongs to Longnan City, Gansu Province, is located in the south of Gansu Province and the northeast of Longnan City. Chengxian was called Chengzhou in ancient times, Chengzhou in the Western Wei Dynasty and Jiangzhou as a county in the Ming Dynasty. Cheng County has jurisdiction over 14 towns and 3 townships, 15 neighborhood committees and 245 villagers' committees, with a total area of 1676.54 square kilometers, a total population of 269800 and a resident population of 246800, of which the urban population is 120200, and the urbanization rate is 48.7% (2018). Chengxian County is located in the residual vein of the West Qinling Mountains, the terrain is high in the northwest, low in the southeast, between 750m and 2377 meters above sea level, is a warm temperate semi-humid climate, four distinct seasons, moderate cold and warm, known as "Longyou small Jiangnan", "Longyou granary". Chengxian County is rich in natural resources, including mineral resources, water resources, biological resources and so on.