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.
Luochuan County is located in the middle of Shaanxi Province in China. In the south of Yan'an. (longitude 109 °13 "14"-109 °45 "47" east, latitude 35 °26 "29"-36 °04 "12" north. The county covers an area of 1886 square kilometers, with a resident population of 229600 (2016), mainly of the Han nationality. Qin and Han Zhiyi County, Wei and Jin Xiongnu entered the occupation, and the first eight years after the establishment of Qinyao County (393), Luochuan County was located in the north of Xianxian County, which got its name from Luoshui County. After several relocation, the name of the county is still in use today. In March 2019, it was listed as the first batch of revolutionary cultural relics protection and utilization district and county list.