At 5:12 am on April 18, 1906, a major earthquake struck San Francisco and northern California. As buildings collapsed from the shaking, ruptured gas lines ignited fires that would spread across the city and burn out of control for several days. With water mains out of service, the Presidio Artillery Corps attempted to contain the inferno by dynamiting blocks of buildings to create firebreaks.[35] More than three-quarters of the city lay in ruins, including almost all of the downtown core.[17] Contemporary accounts reported that 498 people lost their lives, though modern estimates put the number in the several thousands.[36] More than half the city's population of 400,000 were left homeless.[37] Refugees settled temporarily in makeshift tent villages in Golden Gate Park, the Presidio, on the beaches, and elsewhere. Many fled permanently to the East Bay.
The Palace of Fine Arts at the 1915 Panama-Pacific Exposition
Rebuilding was rapid and performed on a grand scale. Rejecting calls to completely remake the street grid, San Franciscans opted for speed.[38] Amadeo Giannini's Bank of Italy, later to become Bank of America, provided loans for many of those whose livelihoods had been devastated. The destroyed mansions of Nob Hill became grand hotels. City Hall rose again in splendorous Beaux Arts style, and the city celebrated its rebirth at the Panama-Pacific International Exposition in 1915.[39]
In ensuing years, the city solidified its standing as a financial capital; in the wake of the 1929 stock market crash, not a single San Francisco-based bank failed.[40] Indeed, it was at the height of the Great Depression that San Francisco undertook two great civil engineering projects, simultaneously constructing the San Francisco – Oakland Bay Bridge and the Golden Gate Bridge, completing them in 1936 and 1937 respectively. It was in this period that the island of Alcatraz, a former military stockade, began its service as a federal maximum security prison, housing notorious inmates such as Al Capone, George "Machine Gun" Kelly, and Robert Franklin Stroud, The Birdman of Alcatraz. San Francisco later celebrated its regained grandeur with a World's Fair, the Golden Gate International Exposition in 1939–40, creating Treasure Island in the middle of the bay to house it.
During World War II, the Hunters Point Naval Shipyard became a hub of activity, and Fort Mason became the primary port of embarkation for service members shipping out to the Pacific Theater of Operations.[18] The explosion of jobs drew many people, especially African Americans from the South, to the area. After the end of the war, many military personnel returning from service abroad and civilians who had originally come to work decided to stay. The UN Charter creating the United Nations was drafted and signed in San Francisco in 1945 and, in 1951, the Treaty of San Francisco officially ended the war with Japan.
The USS San Francisco steams under the Golden Gate Bridge in 1942, during World War II.
Urban planning projects in the 1950s and 1960s involved widespread destruction and redevelopment of west side neighborhoods and the construction of new freeways, of which only a series of short segments were built before being halted by citizen-led opposition.[41] The Transamerica Pyramid was completed in 1972,[42] and in the 1980s the Manhattanization of San Francisco saw extensive high-rise development downtown.[43] Port activity moved to Oakland, the city began to lose industrial jobs, and San Francisco began to turn to tourism as the most important segment of its economy. The suburbs experienced rapid growth, and San Francisco underwent significant demographic change, as large segments of the white population left the city, supplanted by an increasing wave of immigration from Asia and Latin America.[44][45] Over this period, San Francisco became a magnet for America's counterculture. Beat Generation writers fueled the San Francisco Renaissance and centered on the North Beach neighborhood in the 1950s.[46] Hippies flocked to Haight-Ashbury in the 1960s, reaching a peak with the 1967 Summer of Love.[47] In the 1970s, the city became a center of the gay rights movement, with the emergence of The Castro as an urban gay village, the election of Harvey Milk to the Board of Supervisors, and his assassination, along with that of Mayor George Moscone, in 1978.[48]
The 1989 Loma Prieta earthquake caused destruction and loss of life throughout the Bay Area. In San Francisco, the quake severely damaged structures in the Marina and South of Market districts and precipitated the demolition of the damaged Embarcadero Freeway and much of the damaged Central Freeway, allowing the city to reclaim its historic downtown waterfront.
During the dot-com boom of the late 1990s, startup companies invigorated the economy. Large numbers of entrepreneurs and computer application developers moved into the city, followed by marketing and sales professionals, changing the social landscape as once-poorer neighborhoods became gentrified. When the bubble burst in 2001, many of these companies folded, and their employees left, although high technology and entrepreneurship continue to be mainstays of the San Francisco economy
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