The Manifest Destiny and federal policies guided the outcome of Native American tribes on the Great Plains and west of the Great Plains by an ideology that was expressed by white Americans during this era.
During the 19th century, the doctrine of Manifest Destiny, which believed in the expansion of American territory from the Atlantic to the Pacific, led to the westward expansion of settlers and the encroachment on Native American lands. Federal policies such as the Indian Removal Act of 1830 and the policy of Indian reservations aimed to displace and confine Native American tribes.
According to the Manifest Destiny, the white Americans believed that they were destined by God to take over all territories in North America and extend this expansion westward or "from sea to shining sea" to say. So, this movement made the Native Americans lose rights, land, and liberty that they maintained for years before westward expansion.
In all, the spirit of Manifest Destiny and federal policies significantly contributed to the marginalization and displacement of Native American tribes on the Great Plains and beyond.