San Francisco is incorporated as a city…
April 1850 CE
The California gold rush starting in 1848 has led to a large boom in population, including considerable immigration.
Between January 1848 and December 1849, the population of San Francisco had increased from one thousand to twenty-five thousand.
The rapid growth will continue through the 1850s and under the influence of the 1859 Comstock Lode silver discovery.
This rapid growth will complicate city planning efforts, leaving a legacy of narrow streets that continues to characterize the city to this day.