San Diego is a city on the Pacific coast in Southern California, right next to the border between Mexico and the United States. With a 2020 population of 1,386,932, it is the eighth most populous city in the United States and the county seat of San Diego County, the fifth most populous county in the United States, with an estimated population of 3,286,069 in 2021. The city is known for its year-round mild climate, natural deep-water harbor, extensive beaches and parks, long association with the US Navy and recent emergence as a hub Center for the development of health care and biotechnology. San Diego is the second largest city in the state of California, after Los Angeles. Historically the home of Kumeyaay, San Diego is often referred to as the "birthplace of California" because it was the first site visited and settled by Europeans on the west coast of the United States. When he landed in San Diego Bay in 1542, Juan Rodríguez Cabrillo claimed the area to Spain, creating the basis for the settlement of Alta California 200 years later. The Presidio and Mission San Diego de Alcalá, founded in 1769, formed the first European settlement in present-day California. In 1821, San Diego became part of the newly declared Mexican Empire, which was reformed as the First Mexican Republic two years later. California became part of the United States in 1848 after the Mexican-American War and was admitted to the union as a state in 1850. San Diego's main economic driver is military and defense related activities, tourism, international trade, research and manufacturing. The city is the economic center of the San Diego-Tijuana metropolitan area, the second most populous transboundary metro area in the Western Hemisphere (after Detroit-Windsor), home to approximately 4,922,723 people in 2012 The main border crossing between San Diego and Tijuana. Diego and Tijuana, San Ysidro's port of entry, are the world's busiest international land border crossings outside of Asia (fourth overall). The city's airport, San Diego International Airport, is the busiest single-runway airport in the world. Find and hire a top agency or company for your next big project related to Digital Marketing, Advertising, Social Media Marketing, Content Writing, Market Research, PR, Email Marketing, Mobile App Development, Web Design, Web application development, Media Planning and many more in the USA and other countries on AgencyNetwork.