Explain the three theories held by many historians on the first people to settle the Americas and the evidence for each Theory.

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explanation:

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

the answer is a) high entry costs

i'm not certain but i'm pretty sure it was spanish and portuguese america.