Question

The philosophy used to justify U.S expansion into the west is known as:

Answer 1

The Manifest Destiny.

Step-by-step explanation:

The concept of the Manifest Destiny saw the right of the USA to expand westward and reach the shores of the Pacific as a manifestation of God´s will. The vast territories lying west of American republican soil for many decades in the 19th century were deeemed as a natural object of expansion for the USA, such an outcome was the result of the designs of Providence, supporters believed.