What was meant by the "closing" of the Western frontier? a) the settlement of most of the land between the East and West Coasts
b) the decision by the United States government to prevent additional settlement
c) the failure of American railroad companies to establish cities and towns out west
d) the evacuation of many Western towns due to attacks from Native Americans

b) the decision by the United States government to prevent additional settlement

Explanation:

What was meant by the "closing" of the Western frontier was that the United States government wanted to prevent additional settlement.

This decision was as a result of the government's plan to promote the westward expansion after the Civil War, but however, they had to close the Western frontier to prevent additional settlers.

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explanation:

the answer for 3 is b and the answer for 4 is d