The removal of the Cherokee, Muscogee, Seminole, Chickasaw, and Choctaw nations took place under the Indian Removal Act of 1830, not an executive order.

Andrew Jackson did not rely on his presidential power but worked to extinguish Indian title to their lands through Congress against opposition by people like  Davy Crockett of Tennessee.

Indians were not citizens but members of sovereign nations.

The bishops did not "endorse" Trump.