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.
Wugong County, which belongs to Xianyang City, Shaanxi Province, is located in the hinterland of Guanzhong Plain, bordering Xingping City in the east, Weishui River in the south and Zhouzhi County in Xi'an City in the south, Yangling Agricultural High-tech Industry demonstration Zone in the west, Fufeng County in Baoji City, and Qian County in the north. It is 87 kilometers away from Xi'an and 50 kilometers from Xianyang City, with a county area of 397.8 square kilometers. Wugong County, located in the hinterland of Guanzhong Plain, is the birthplace of Chinese agricultural civilization. Guoyu Jin Yu said: "in the past, Shaodian married in Youyu, gave birth to Huangdi and Yan Emperor." Yan Emperor became with Jiang Shui, and Yellow Emperor with Ji Shui. Success is different from virtue, so the Yellow Emperor is Ji and Yan Di is Jiang. " Jishui is the lacquer water in today's martial arts. Houji established the first state in Chinese history in Zhengjiapo, Wugong town, and became the ancestor of the Zhou nationality. Ji Fa, King of Zhou Wu, destroyed Yin and Shang Dynasty and built the Western Zhou Dynasty.