San Francisco became part of the United States with the signing of the Treaty of Guadalupe Hidalgo in 1848.
European visitors to the San Francisco Bay Area were preceded at least 8,000 years earlier by Native Americans.
The cultural unit, Ohlone, to which the San Francisco natives belonged did not recognize the city or county boundaries imposed later by Americans, and were part of a contiguous set of bands that lived from south of the Golden Gate to San José.
There is no mention of Native Americans in Sir Francis Drake's accounts of his trip to the San Francisco Bay in 1579, which is consistent with the seasonal use pattern of the area described in the archaeological record.
According to one anthropologist, the indigenous name for San Francisco was "awaste", meaning, "place at the bay".