Answer: 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.
They discovered the New World by accident. They were looking for new routes that would take them quicker to Asia to trade. At the time they did not know the earth was round. They believed it was flat and would sail straight to Asia. Therefore, when Colombus hit the New World he called the natives Indians because he believed he had reached India.
yes i do think its important...jk i dont know