She doesn't make an opinion about the Jewishness or Goyshness of the Back Hebrews. After all, she is right that slave trafficking and Amerindian extermiantion was inhumane. She isn't messing up with Israel at all.
Slavery was wrong, but I don't think it makes American society any worse than any other society. Even Africans enslaved each other. Just about all civilizations of the past had slavery involved in them at some time.
Besides, she speaks as if white people have never been slaves, which is very far from the truth.
As for the American Indians, they were also killing each other for territory. The whites were like one more tribe fighting for the land, but they just were a lot better at it. Indians weren't exactly innocent either. They attacked and killed people in white settlements, peaceful or not. If white people hadn't won, there wouldn't have been the wonderful, beautiful United States. I'm proud of Manifest Destiny and all it brought about, winning the West and expanding this great country.