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.
Because some people do not have health insurance, or enough money to pay the medical bills.
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The ancient civilizations developed law codes and the idea of divine kingship based off of what they knew. Law codes, like the code of Hamurabi, were made by the rulers according to the divine belefs. We have the similar example in Islamic countries today, that are secular but also take the law of Sheriat.
Farmers destroying the soil with tobacco crops. Hope this helps!