Why was President Andrew Jackson
trying to get the Eastern Tribes removed?

in order to open new land for settlement by citizens of the United States.

Explanation:

With the onset of westward expansion and increased contact with Indian tribes, President Jackson set the tone for his position on Indian affairs in his message to Congress on December 6, 1830. Jackson’s message justified the removal policy already established by the Indian Removal Act of May 28, 1830.

the doctrine of nullification recommended that states living inside the union have the one-sided, inalienable ideal to void any law made by the national government that could be esteemed illegal.

the united states was shaped based on a general agreement among its individual states. hence, it is inferred that under the hypothesis of invalidation, since the states are the establishment of the union, they have the ability to referee and disprove unlawful laws.

d) the constitution rights of native americans and their right to self-government on reservations