Review the map above. How did the idea of Manifest Destiny affect the U.S. border throughout the 1800s?

The border of the U.S. remained the same until the late 1890s.
The border of the U.S. expanded all the way to the west coast.
The border of the U.S. shrank as other countries returned to colonization.
The border of the U.S. expanded to contain large amounts of land in Canada.

It expanded all the way to the west coast. As you can tell from the map dates, there was more land purchased toward the west coast in the 1800s, when the idea of manifest destiny was alive and well. :)

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Francocanacariid Francocanacariid · Answer 2

The idea of the Manifest Destiny affected the borders of the United States during the 1800s causing them to spread all the way to the west coast.

Manifest destiny is a phrase that expresses the belief that the United States of America has the mission to expand, spreading their form of freedom and democracy. Proponents of Manifest Destiny believed that expansion was not only good, but that it was also obvious ("manifest") and inevitable ("destiny"). Originally a phrase of 19th century politics, manifest destiny became a standard historical term, often used as a synonym for the expansion of the United States of America through North America and the Pacific Ocean.

The phrase "manifest fate" was first used primarily by supporters of Jacksonian democracy in the 1840s, to promote the annexation of much of what is now the western United States of America (the Oregon Territory, the Texas annexation and Mexican release) starting with the presidency of James Knox Polk.