San José in 1840’s

During the Bear Flag Revolt, Captain Thomas Fallon led a small force from Santa Cruz and captured the pueblo without bloodshed on July 11, 1846. Fallon received an American flag from John D. Sloat, and raised it over the pueblo on July 14, as the California Republic agreed to join the United States following the start of the Mexican-American War. Fallon would later become the tenth mayor of San Jose. It's unclear whether or not Fallon ordered all townspeople of Spanish/Mexican origin out of San Jose, as some local historians claimed. Direct descendants of the Spanish founders have continued to make their homes in San Jose, and still reside there to this day (2010).^{[citation needed]}
During the California Gold Rush period, the New Almaden Quicksilver Mines just south of the city were the largest mercury mines in North America (mercury was used to help separate gold from ore). The cinnabar deposits were discovered in 1845 by a Mexican cavalry captain, Andres Castillero, when he recognized the red powder used by local Ohlone Indians to decorate the chapel at Mission Santa Clara. Mining operations began in 1847 at what was the first operating mine in the province, just in time for the Gold Rush. The importance of the mercury industry at the time explains why the local newspaper is named the Mercury News.
On March 27, 1850, San Jose became the first incorporated city in the U.S. state of California; the first mayor was Josiah Belden. It also served as the state's first capital with the first and second sessions of the California Legislature, known as the Legislature of a Thousand Drinks, being held there in 1850 and 1851. The legislature was unhappy with the location, as no buildings suitable for a state government were available in the city, and took up State Senator Mariano Guadalupe Vallejo's offer to build a new capital on land he donated to the state in what is now Benicia.    Source: http://en.wikipedia.org/wiki/History_of_San_Jose,_California

Among the founding members of Trinity who settled in San Jose in the 1840s were Major John Hensley, Moses Schallenberger.  Others need to be identified in the entry “First American Settlers in Santa Clara Valley.”