Your answer is D
The closing of the frontier cause a reduction in individualism. The federal government gained more control over the direction of the nation. On the frontier people had to depend on themselves and their neighbors. With the closing of the frontier people had more reliance on assistance of government.
The way the closing of the American western frontier contributed to expansionist policies is D. The US was running out of living space as more settlements in the West were established
This refers to the type of policy that a person or country has in terms of its expansion into other territories.
Hence, we can see that after the closing of the American western frontier, there was a reduction in individualism and thus the US was running out of living space as more settlements in the West were established
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