Question

What was the belief used to justify westward expansion of America’s borders in the 1800s

Answer 1

Manifest Destiny (b)

Step-by-step explanation:

In 1845, John L. O'Sullivan believed that God wanted Americans to broaden the United States to the Pacific Ocean. Manifest Destiny means "Obvious Purpose," so he is saying that the purpose is obvious that people are going to expand west. Hope this helps

Answer 2

Manifest Destiny is the answer you are searching for