Answer:
The answer is stated below.
Step-by-step explanation:
Westward expansion started with "Louisiana purchase" and "Gold Rush" supplemented by the ideology of "Manifest Destiny". The expansion also involved the problem of native Indians tribes who were resisting to give up their homelands. This problem is solved by taking several measures such as first a policy was adopted to force these tribes further west. But when the conflict could not be solved easily a policy of assimilation of these tribes to modern culture, was kept in hand.