Explain how manifest destiny is important to westward expansion.
Manifest destiny was important as one of the causes behind westward expansion. Manifest destiny was the idea that the United States was destined by God to expand out across the North American continent. The idea was that the US had a system of government, a society, and a religion that was superior to that of the Indians and the Mexicans. Therefore, the US deserved to have the land more than those groups did. The US was sure (people thought) to make better use of the land and to use it to improve the world as a whole. This idea helped to motivate westward expansion.