What is the origin of the term "white supremacy"?
Online Etymology Dictionary gives this as the origin of the term:
White supremacy attested from 1868, American English [John H. Van Evrie, M.D., "White Supremacy and Negro Subordination," New York, 1868]....
Yet OED records earlier attestation:
The belief or theory that white people are superior to other peoples, and should therefore have greater power, authority, or status. Also: a social system based on or perpetuating the political, economic, and cultural dominance of white people.
1824 T. S. Winn Emancipation 57 It may be too late by any means, however wisely and honestly attempted, to reduce them to order and obedience under White supremacy, or even among themselves.
1839 H. Bevan Thirty Years India II. xviii. 299 The security of our empire in the East would be greatly strengthened if..our functionaries would abandon, or at least conceal, those notions of White supremacy, which are frequently absurd, and always offensive.
The disparity between those two sources suggests the story presented may be incomplete, and neither source delves into preceding terminology that might have helped to chart the course of the development of the term.
Who was the first person to use the term?
How has the meaning changed or developed?
In which historical periods has the term been used most often?