The study of history usually involves all of the following elements except

a) a theory of causation that explains why events happen
b) a clear, logical end that explains everything
c) empirical data presented to support conclusions
d) a decision about which events and activities matter to human beings

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 !

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other sources of text

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this can be magazines, news reports, scholarly articles, textbooks, research papers etc.