Which geographic area was added to the united states after the louisiana state purchase?

The Oregon territory

Explanation:

During this time the U.S. was fulfilling the manifest destiny, which was the expansion of the U.S. westward. After the Louisiana purchase in 1803, the U.S. bought the Oregon territory in 1846, west of the Louisiana territory, thus partially fulfilling the manifest destiny.

I hope this helps :)

equal area projections

equal-area projection. a projection in which regions on the earth's surface that are of equal area are represented as equal.