Whose election to the presidency marked a beginning of the reduction of cherokee rights?

Jackson--his presidency was marked by the Indian Removal Act and forced migration of the Cherokee people. 

Jackson supported the right of white men to land access in the Southeast. Though the Cherokee had assimilated, owned land, and had created a democratic government they were still not white and therefore not fully accepted by the American people or society. Jackson supported Georgia's efforts to relocate the Cherokee which led to the Trail of Tears and relocation to Indian Territory now the state of Oklahoma.