What development most likely caused this sustained increase in US peacetime defense spending?

d

step-by-step explanation:

look at the x and y axis

i do believe its (d) it allowed the government to offer pioneers sixty acres of western land if they lived on it and made improvements to it.

explanation: signed into law in may 1862, the homestead act opened up settlement in the western united states, allowing any american, including freed slaves, to put in a claim for up to 160 free acres of federal land. by the end of the civil war, 15,000 homestead claims had been established, and more followed in the postwar years

syria

tens of thousands of people were killed in as it’s longtime leader attempted to stay in power.

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