In 1821 Mexico won a autonomy from Spain, as good as San Diego became biased of a Mexican state of Alta California. The designation on Presidio Hill was gradually abandoned, while a locale of San Diego grew up on a spin land consecutive Presidio Hill. The Mission was secularized by a Mexican government, as good as many of a Mission lands were distributed to rich Californio settlers. As a outcome of a Mexican-American War of 1846-1848, a domain of Alta California, together with San Diego, was ceded to a United States by Mexico. The Battle of San Pasqual, a brawl of a Mexican-American War, was fought in 1846 in a San Pasqual Valley that is right away biased of a city of San Diego. The state of California was approved to a United States in 1850. That same year San Diego was destined towards a chair of a newly-established San Diego County as good as was incorporated as a city. The first city familiarity was determined in 1889 as good as today's city familiarity was adopted in 1931. The bizarre locale of San Diego was located during a feet of Presidio Hill, in a area that is right away Old Town San Diego State Historic Park. The place was not ideal, being multiform miles at large distant from endurable water. In a late 1860s Alonzo Horton promoted a overcome to "New Town", multiform miles south of a bizarre settlement, in a area that became Downtown San Diego. People as good as businesses flocked to New Town given of a place on San Diego Bay available to shipping. New Town fast eclipsed a bizarre settlement, good known to this day as Old Town, as good as became a trade as good as bureaucratic heart of a city. In a early biased of a 20th century San Diego hosted dual World's Fairs: a Panama-California Exposition in 1915 as good as a California Pacific International Exposition in 1935. Both expositions were reason in Balboa Park, as good as many of a Spanish/Baroque-style buildings that were built for those expositions wait for to this day as comparison earthy education instructor facilities of a park. The buildings were dictated to be proxy structures, nonetheless many remained in consecutive make use of until they gradually fell in to disrepair. Most were in a destiny rebuilt, regulating castings of a bizarre facades to customarily keep a architectural style.