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.
Answer:
Rich land of cotton plantation
In the short term, the voyages led to the destruction of the natives of the lands that Columbus found. Some of them were killed outright. Others were enslaved. Many died of diseases brought by the Europeans.
