What is the relationship between manifest destiny and the frontier?
a. manifest destiny was essential in pushing the frontier farther west toward the pacific ocean.
b. manifest destiny was fueled by the desire to conquer american indians who lived on the frontier.
c. the settlers of the frontier opposed manifest destiny and tried to fight against its implementation.
d. the settlers on the frontier grew prosperous because they believed in the concept of manifest destiny.

A. Manifest destiny was essential in pushing the frontier farther west toward the Pacific Ocean.

Explanation:

Manifest destiny was widely held belief in the 19th century United States that its settlers were destined to expand across North America. Manifest Destiny was a theory that argued that "America" had a religiously supported right and push to control all of the land between the Atlantic and the Pacific Oceans. Manifest destiny has three basic themes:

a.The special virtues of the "American people" and their institutions.

b.The mission of the "United States" to redeem

c.There was a sense of irresistible destiny to accomplish the duties.

hello!

according to the passage the most suitable options are two. the first one is "by leading the aef to victory in several key battles" like the battle of saint- mihiel and the battle of cantigny mentioned in the passage you copied here. the second one is "by the aef and allied forces defeat germany" since the passage says that his army destroy the german resistance in the meuse- argonne offensive. and also, "by insisting that the aef operate as an independent force".

hope this