<span>Assuming that this is referring to the same list of options that was posted before with this question, <span>the correct response would be the one having to do with how this discovery led to a "gold rush," that brought thousands of settlers out to the West, since this played a role in the westward expansion of the US. </span></span><span />
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.
Hiring a substitute so A is the answer.
The Cherokees repeated appeals to the United States government didn't really slow down the theft of their land. The U.S. government didn't repress the theft of Native American land by individuals. It even encouraged it military and economically and created laws to strip them away of their land, such as the Dawes Act.
