4 is the correct answer hope it helped you :)
Answer:
In the late 1800’s and early 1900’s, the United States went through an era of imperialism. At the time, the US was quite powerful, but was looking to continue to spread their territory, make themselves even stronger, and have multiple trade routes to have all the resources they needed and wanted.
Hope this helped! :)
Explanation:
<em>Brainliest?</em>
D. Plains Indians started hunting buffalo more efficiently.
This helped them move more accessibly throughout the land.
I think the answer should be A
