Excerpts from Books and Wikipedia
"Obviously the President could not censure Jackson because that might encourage Spain to refuse to surrender Florida. (And it might not sit well with the American people.) . . . However, Monroe assured Jackson, he realized how circumstances might occur in which a commanding general may exceed his authority 'with essential advantage to his country.'" [Andrew Jackson 1, p. 367]
"Van Buren sealed his white supremacist policy by carrying out Jackson's Indian Removal. The notorious forced march of the Cherokees along the Trail of Tears occurred on Van Buren's watch. In trying to implement Removal, Van Buren also renewed Jackson's conflict with the Seminoles and wound up fighting the Second Florida War, the longest and most costly of all the army's Indian Wars. . . . So few were the Seminoles in number (some five thousand men, women, and children plus perhaps a thousand blacks), and so remote and inhospitable their lands, the government could well have ignored their refusal to remove to Oklahoma. That it did not do so was mostly owing to pressure from slaveholders who resented the refuge available to runaways." [Howe: What Hath God Wrought, p. 516]