San Diego is a city in the U.S. state of California located alongside the Pacific Ocean in Southern California. With a population of over 1.3 million residents, the city is the eighth-most populous in the United States and the second-most populous in California after Los Angeles. The city is located immediately adjacent to the Mexico–United States border and is the seat of San Diego County, which has a population of nearly 3.3 million people as of 2021. San Diego is known for its mild year-round Mediterranean climate, extensive beaches and parks, its long association with the United States Navy, and its recent emergence as a healthcare and biotechnology development center.
Tijuana is the largest city in the state of Baja California located on the northwestern Pacific Coast of Mexico. Tijuana is the municipal seat of the Tijuana Municipality and the hub of the Tijuana metropolitan area. It has a close proximity to the Mexico–United States border, which is part of the San Diego-Tijuana metro area.
Imperial Beach is a residential beach city in San Diego County, California, with a population of 26,137 at the 2020 United States census, down from 26,324 at the 2010 census. The city is the southernmost city in California and the West Coast of the United States. It is in the South Bay area of San Diego County, 14.1 miles (22.7 km) south of downtown San Diego and 5 miles (8 km) northwest of downtown Tijuana, Mexico.
Rosarito is a coastal city in Playas de Rosarito Municipality, Baja California, on the Pacific Coast of Mexico. As of 2010, the city had a population of 65,278. Located 10 miles (16 km) south of the US-Mexico border, Rosarito is a part of the greater San Diego–Tijuana region and one of the westernmost cities in Mexico. Rosarito is a major tourist destination, known for its beaches, resorts, and events like Baja Beach Fest.
The Kumeyaay, also known as 'Iipay-Tiipay or by the historical Spanish name Diegueño, is a tribe of Indigenous peoples of the Americas who live at the northern border of Baja California in Mexico and the southern border of California in the United States. They are an indigenous people of California.
Tecate is a city in Tecate Municipality, Baja California. It is across the Mexico–US border from Tecate, California. As of 2019, the city had a population of 108,860 inhabitants, while the metropolitan area has a population of 132,406 inhabitants. Tecate is part of the San Diego-Tijuana metropolitan area and the largest city between Tijuana and Mexicali. Tecate is a regional economic hub and popular tourist destination, known as home to the Tecate Port of Entry and to Tecate Beer.
Cabrillo National Monument is at the southern tip of the Point Loma Peninsula in San Diego, California, United States. It commemorates the landing of Juan Rodríguez Cabrillo at San Diego Bay on September 28, 1542. This event marked the first time a European expedition had set foot on what later became the West Coast of the United States. The site was designated as California Historical Landmark #56 in 1932. The area was listed on the National Register of Historic Places on October 15, 1966.
El Presidio Real de San Diego is a historic fort in San Diego, California. It was established on May 14, 1769, by Gaspar de Portolá, leader of the first European land exploration of Alta California—at that time an unexplored northwestern frontier area of New Spain. The presidio was the first permanent European settlement on the Pacific Coast of the present-day United States. As the first of the presidios and Spanish missions in California, it was the base of operations for the Spanish colonization of California. The associated Mission San Diego de Alcalá later moved a few miles away.
The South Bay, also known as South County, is a region in southwestern San Diego County, California consisting of the cities and unincorporated communities of Bonita, Chula Vista, East Otay Mesa, Imperial Beach, Lincoln Acres, National City, and South San Diego.
The written history of the San Diego, California, region began in the present state of California when Europeans first began inhabiting the San Diego Bay region. As the first area of California in which Europeans settled, San Diego has been described as "the birthplace of California."
Downtown San Diego is the city center of San Diego, California, the eighth largest city in the United States. In 2010, the Centre City area had a population of more than 28,000. Downtown San Diego serves as the cultural and financial center and central business district of San Diego, with more than 4,000 businesses and nine districts. The downtown area is the home of the San Diego Symphony and the San Diego Opera as well as multiple theaters and several museums. The San Diego Convention Center and Petco Park, home of the San Diego Padres, are also located downtown. Downtown San Diego houses the major local headquarters of the city, county, state, and federal governments.
Point Loma is a seaside community within the city of San Diego, California, United States. Geographically it is a hilly peninsula that is bordered on the west and south by the Pacific Ocean, the east by the San Diego Bay and Old Town, and the north by the San Diego River. Together with the Silver Strand / Coronado peninsula, the Point Loma peninsula defines San Diego Bay and separates it from the Pacific Ocean. The term "Point Loma" is used to describe both the neighborhood and the peninsula.
Naval Training Center San Diego (1923–1997) is a former United States Navy base located at the north end of San Diego Bay, commonly known as "boot camp". The Naval Training Center site is listed on the National Register of Historic Places, and many of the individual structures are designated as historic by the city of San Diego.
San Diego County, officially the County of San Diego, is a county in the southwestern corner of the U.S. state of California. As of the 2020 census, the population was 3,298,634, making it California's second-most populous county and the fifth-most populous in the United States. Its county seat is San Diego, the second-most populous city in California and the eighth-most populous city in the United States. It is the southwesternmost county in the 48 contiguous United States, and is a border county. It is also home to 18 Native American tribal reservations, the most of any county in the United States.
The San Pasqual Band of Diegueño Mission Indians of California is a federally recognized tribe of Kumeyaay people, who are sometimes known as Mission Indians.
The following is a timeline of the history of the city of Tijuana, Baja California, Mexico.
The following is a timeline of the history of the city of Oakland, Alameda County, California, United States.
The following is a general historical timeline of the city of Los Angeles, California in the United States of America.
Californiaportal 
