Oh I know that. My parents were both from Europe -- my mother emigrated in 1929; my father was born here, but his parents came over in the early 1900's. I suppose if you stretch back my ancestry far enough, you will find that someone on either or both sides was a slave of some sort. In fact, if I remember my European history right, those who worked the land were called serfs -- they were for all practical purposes slaves.
I'm just commenting on those who would try to late the guilt for the U.S. slavery period on every white man's shoulder.
Give 'em hell! (8^D)