San Diego (/ˌsæn diˈeɪɡoʊ/ SAN dee-AY-goh, Spanish: [san ˈdjeɣo]; Spanish for 'Saint Didacus') is a city on the Pacific Ocean coast of Southern California located immediately adjacent to the Mexico–United States border. With a 2020 population of 1,386,932, it is the eighth most populous city in the United States and the seat of San Diego County, the fifth most populous county in the United States, with 3,338,330 estimated residents as of 2019. The city is known for its mild year-round climate, natural deep-water harbor, extensive beaches and parks, long association with the United States Navy, and recent emergence as a healthcare and biotechnology development center. San Diego is the second largest city in the state of California, after Los Angeles.
Longzhou County, a county under the jurisdiction of Chongzuo City, Guangxi Zhuang Autonomous region, is located in the southwest of Guangxi, 200km away from Nanning, Jiangzhou District of Chongzuo City to the east, Ningming County and Pingxiang City to the south, Daxin County to the northeast, and Vietnam to the northwest. it is rich in heat, abundant rainfall and sufficient sunshine, with a total area of 2317.8 square kilometers, five towns and seven townships, with a total population of 272287 in 2017. Longzhou, an important border defense town, is a famous historical and cultural city of border trade with many years of history, with Shuikouguan in the west and Pinggeguan in the southwest. In the fifteenth year of Guang Xu (1889), Longzhou was established as a land trade port, which was the earliest trade port opened to the outside world in Guangxi. Longzhou is the revolutionary resort of Zuojiang led by Communist Party of China. On February 1, 1930, in Li Mingrui and Yu Zuoyu