During WWII, why did California notice
such a massive increase in their
population?

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.

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. With all the new economy activity, California was lifted out of the great depression.

Explanation:

increased food supply

improved public health

increased birth rates

hope this : d