The question is kinda lacking. Probably, it has choices to make the question answerable.
I believe it's the first one!
Answer:
it was a gateway to the larger west in 1861
Answer:
The population of California grew significantly, largely due to servicemen who were stationed at the new military bases/training facilities and mass influx of workers from around the U.S. in the growing defense industries. ... Over 500,000 people moved to California from other states to work in the growing economy.
I believe the answer would be D.) since it formed because of how poor the conditions of the migrant workers worked in were
