What do you think was the most important factor behind the closing of the American fronter the discovery of mineral resources, government and grants and promotions or the completion of the railways ? Use evidence to support your answer .

government

Explanation:

In 1890 the Census Bureau broadcast the. closure of the frontier

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:

the correct option is a

explanation:

the movement mainly consisted of white farmers from the south who sought the relieve of farmers from their hardship. hope this !

by kd