Answer :
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. Therefore, this philosophy was essential in pushing the frontier farther west towards the Pacific Ocean.
The relationship between manifest destiny and the frontier is Manifest destiny was essential in pushing the frontier farther west toward the Pacific Ocean. Thus the correct answer is A.
What is Manifest Destiny ?
The cultural belief in the 19th century in America where American settlements were obliged to spread across North America is referred is Manifest destiny. Its object of it is to expand its control and spread capitalism and democracy throughout North America.
Manifest destiny was critical in attempting to push the frontier westward toward the Pacific Ocean. It was the divine law right of the United States to extend its frontier.
Therefore, option A Manifest destiny was essential in pushing the frontier farther west toward the Pacific Ocean is appropriate.
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