American Agricultural Area (1847-1940)
The Gold Rush and the annexation of California by the United States brought drastic changes to San Pablo. A stage route was established from San Francisco and Oakland to Sacramento, and ran right along the road we call San Pablo Avenue today. A small stage stop village began to appear around the Castro/Alvarado Adobe home at the corner of San Pablo

Avenue and Church Lane.
Saloons lined the main street, which was wide enough (60~100 feet) to accommodate the movement of cattle herds. The Castro descendants began to sell off portions of their Rancho to American ranchers and farmers. A Post Office was established, a school was built, and churches founded.
Many of the new ranchers were new immigrants to the United States, and most o
f them were Azore Island Portuguese. There were also immigrants from Chile, Germany, France, and China. A large camp of Chinese shrimp fishers lived along the edge of San Pablo Bay from 1870 to 1912. (San Pablo went all the way to the bay in those days.) A few African-Americans lived in the area as well. We can assume that a number of Mexicans, such as the Castros and Alvarados, continued to live here also.
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