Question

What belief declared that america had the right to expand all the way west to the pacific ocean

Answer 1

Manifest Destiny

during the second half of the 19th century, the concept of Manifest Destiny held that it was the ordained right of the United States to expand its borders to the Pacific Ocean also beyond.

Answer 2

Manifest Destiny is the belief that declared that America had the right to expand all the way west to the Pacific Ocean.