became a U.S. citizen and a prominent ranch owner/businessman in California after the war. Many others were not so fortunate as droughts decimated their herds in the early 1860s and they could not pay back the high cost mortgages (poorly understood by the mostly illiterate ranchers) they had taken out to improve their lifestyle and subsequently lost much or all of their property when they could not be repaid. Californios did not disappear. Some people in the area still have strong identities as Californios. Thousands of people who are descended from the Californios have well-documented genealogies of their families. Mexican activists claim there was an integrated society of Mexicans, Native Americans, Mestizos and American immigrants, which had evolved over 77 years beginning with the founding of Misión San Diego in the Alta California territory in 1769. The developing agricultural economy of California allowed many Californios to continue living in pueblos alongside Native peoples and Mexicanos well into the 20th century. These settlements grew into modern California cities, including Santa Ana, San Diego, San Fernando, San Jose, Monterey, Los Alamitos, San Juan Capistrano, San Bernardino, Santa Barbara, Arvin, Mariposa, Hemet and Indio. From the 1850s until the 1960s, the Hispanics (of Spanish, Mexican and regional Native American origins) lived in relative autonomy. They practiced a degree of social racial segregation by custom, while maintaining Spanish-language newspapers, entertainment, schools, bars, and clubs. Cultural practices were often tied to local churches and mutual aid societies. At some point in the early 20th century, the official recordkeepers (census takers, city records, etc.) began grouping together all Californios, Mexicanos, and Native (Indio) peoples with Spanish surnames under the terms "Spanish", "Mexican", and sometimes, "colored"; some Californios even intermarried with Mexican Americans (those whose ancestors were refugees escaping the Mexican Revolution in 1910). Alexander V. King has estimated that there were between 300,000 and 500,000 descendants of Californios in 2004. Californios in the California Gold Rush In 1848, gold is discovered at Sutter's Mill, near Coloma, California. This discovery was made only nine days before the Treaty of Guadalupe Hidalgo was signed, which turned over California to the United States as a result of the Mexican–American War. Large influx of foreigners diluting Californio population From the end of 1849 to the end of 1852, the population in California increased from 107,000 to 264,000 due to the California Gold Rush. In early 1849, approximately 6,000 Mexicans, many