By 1877 john d. rockefeller controlled 90 percent of oil refineries in the united states because of a. government subsidies. c. from the railroads. b. the purchase of competitors companies during poor economic times. d. the financial assistance from his father.

the dust bowl, otherwise known as the dirty thirties, was a huge dust storm that killed multiple (and i mean  multiple) farmer's crops, leaving them homeless, and foodless, and jobless. in california, there were 5.7 million residents, and the population shrank as mexicans were repatriated. however, when the dustbowl happened, a lot of people began to move to california. by 1940, 250,000 people had arrived. therefore, your answer would be  the population increased, massively.  i hope this !

explanation:

puritans hope this