The reality of the history of the American Presidency is that white supremacy and racism is rampant.
Nine of the first twelve Presidents owned slaves, and many of them mistreated them, including cruelty and separation of families by slave sales.
Also, many Presidents clearly saw native Americans as subhuman, and had no concern about the loss of life and the stealing of native American lands.
Additionally, many Presidents saw people of Asian or Latino heritage as being inferior, and treated them in openly racist ways.
The story of American history is of widespread massacres of people of color, no matter what their ancestry, and not just in the South, but nationwide.
Most American Presidents ignored what was going on, but some were more vocal and outspoken in their white supremacy and racism, enunciating their hateful, prejudiced views.
The vocal group, willing to make it part of their Presidencies include Andrew Jackson, regarding native Americans and African Americans; Andrew Johnson, toward African Americans during Reconstruction; Woodrow Wilson, who made clear his disregard for civil rights for African Americans, and open disdain for people of Asian ancestry, as well as the nations they originated from (China and Japan); and now Donald Trump, who has used the racist and white supremacist language to appeal to his base in a gross manner.
Since Trump has the advantage of modern media reporting and social media, particularly Twitter, which the others did not have, his white supremacy and racist rants are much more dangerous than those of Jackson, Johnson, and Wilson.