Riverside is a city in Riverside County, California, United States, located in the Inland Empire metropolitan area. Riverside is the county seat of the eponymous county and named for its location beside the Santa Ana River. It is the most populous city in the Inland Empire as well as Riverside County, and is located approximately east of Los Angeles. It is also part of the Greater Los Angeles area. Riverside is the 59th most populous city in the United States and 12th most populous city in California. As of the 2010 Census, Riverside had a population of 303,871.
Riverside was founded in the early 1870s and is the birthplace of the California citrus industry as well as home of the Mission Inn, the largest Mission Revival Style building in the United States. It is also home to the Riverside National Cemetery.
The University of California, Riverside, is located in the northeastern part of the city. The university also hosts the Riverside Sports Complex. Other attractions in Riverside include the Fox Performing Arts Center, Riverside Metropolitan Museum, which houses exhibits and artifacts of local history, the California Museum of Photography, the California Citrus State Historic Park, and the Parent Washington Navel Orange Tree, one of the two original navel orange trees in California.
The city was founded in the early 1870s beside the Santa Ana River by John W. North, a staunch temperance-minded abolitionist from Tennessee, who had previously founded Northfield, Minnesota. A few years after, the navel orange was planted and found to be such a success that full-scale planting started. Riverside was temperance minded, and Republican. There were four saloons in Riverside when it was founded. The license fees were raised until the saloons moved out of Riverside. Investors from England and Canada transplanted traditions and activities adopted by prosperous citizens. As a result, the first golf course and polo field in Southern California were built in Riverside.
The first orange trees were planted in 1871, but the citrus industry Riverside is famous for beginning three years later (1874) when Eliza Tibbets received three  Brazilian navel orange trees sent to her by a personal friend, William Saunders who was a horticulturist at the United States Department of Agriculture in Washington, D.C. The trees came from Bahia, Brazil. The Bahia orange did not do well in Florida, but its success in Southern California was phenomenal.
The three trees were planted on the Tibbets' property. One of the trees died after it was trampled by a cow during the first year it was planted. After the trampling, the two remaining trees were transplanted to property belonging to Sam McCoy to receive better care than L. C. Tibbets, Eliza's husband, could provide. Later, the trees were again transplanted, one at the Mission Inn property in 1903 by President Theodore Roosevelt (this tree died in 1922), and the other was placed at the intersection of Magnolia and Arlington Ave. Eliza Tibbets was honored with a stone marker placed with the tree. That tree still stands to this day inside a protective fence abutting what is now a major intersection.