Read the information below:
in 1846, the population of san francisco, california, was only 200. by 1852, the city's population was 36,000.
which contributed the most to san francisco's population change?
the gold rush
the mexican-american war
the monroe doctrine
the trail of tears

the american revolution was by the middle and upper class, and the french was by the lower and middle class.

in the 1800s, chinese workers migrated to the united states, first to work in the gold mines, but also to take agricultural jobs, and factory work, especially in the garment industry. chinese immigrants were particularly instrumental in building railroads in the american west, and as chinese laborers grew successful in the united states, a number of them became entrepreneurs in their own right. as the numbers of chinese laborers increased, so did the strength of anti-chinese sentiment among other workers in the american economy. this finally resulted in legislation that aimed to limit future immigration of chinese workers to the united states, and threatened to sour diplomatic relations between the united states and china.