What you recall about outrageous mistreatment of Native Americans is doubtless true. Human cruelty has been so pronounced that it's hard to believe that one people could inflict such pain upon another people, and even seem to get satisfaction out of it.
A few points.
1. White Europeans could be 'savages' in their dealings with the Native American. There is no other way to put it and no excuse. This doesn't apply to all settlers. There always were some who tried to be just - William Penn and the Quakers, for example.
2. I recently finished the book *Champlain's Dream*, a strongly pro-Champlain view of that early explorer. If that book is correct, his dream involved good relations between Native Americans and the European newcomers.
3. The same book covers some of the intense cruelties of one tribe of Indians to another, how they would torture their captives for as long as possible, to inflict as much pain and terror as possible. So the invading Europeans were not dealing with humane societies in many instances. We know, for example, how the Aztecs and Incas dealt with their prisoners-of war - cutting out their hearts while they were still alive, in some cases.
4. As to the African-Americans, they seldom were treated with the same degree of cruelty because they were more valuable while alive, of course. They were a commodity, and it was wise to keep them as physically able and useful as possiblle. Still, they were viewed as an inferior people in most of the nation. Sometimes, as in the case of the Amistad situation, abolitionists came to their defense and won their freedom. Often, if they dared defy their masters, they would be cruelly disfigured or, in extreme cases, lynched.
5. As I stated in an earlier post, the USA is very fortunate that the key leader in the Freedom Movements of the 60s was a minister who believed in non-violence, who preached the message of love as taught by Christ. Yet Dr. King was a man of such courage that he resisted 'unto death' the continuing racial injustice in our society. Dr. King was not a saint - none of us is - but he was a great, great American, and I become intensely annoyed when some people still view him as some sort of wild radical. If he was a radical, so was Christ! It's the kind of radicalism I certainly endorse.
6. Racism still persists among too many Americans of different complexions. It disturbs me when I hear it from white people, especially when they pretend to be such 'good Christians'. But it is rampant among Black Americans, too. And among Latinos, Jews, and (to a lesser degree) among Asian-Americans.
7. I pray for Obama's success as president, for if he fails it will be a blow to racial equality in our country. He is a brilliant man and I share much of his idealism. Yes, I disagree with him sometimes and do worry about some of his associates - the Chicago gang in particular. Unfortuately, people like Jesse Jackson and Al Sharpton are still featured on Fox and elsewhere as spokespersons for the Black community. They are not worthy of such leadership. They tend to be racial hucksters, who make their living off keeping racial antagonism alive, rushing toward every microphone they can find.
8. On the immigration issue, why is it that some people don't understand the word illegal. Illegal entry into the USA is simply that - illegal. The best solution is to grant temporary visas or green cards to laborers who are needed in the USA, but not to allow illegal immigrants to jump to the front of the line when it comes to citizenship. They should await their turn like others do. It is a matter of fair play, plain and simple. It is unrelated to racism, even though that charge is voiced continuously.
9. By the way, the Old Testament is full of atrocities, supposedly ordered by Jehovah God! God regretted that he had created humankind, so he drowns everybody! God tells Joshua to slaughter all the inhabitants of such conquered cities as Jericho, Ai, etc. God insists that King Saul annihilate every last Amalekite. Personally, I don't believe that God commanded any such atrocities, but millions of Christians take these Biblical accounts literally. I'm inclined to think that these stories have helped provide an excuse for Christians to commit cruelties over the years. They have paid little attention to Jesus and the Sermon on the Mount - love your enemy, etc. Or, even the Ten Commandments - :"thou shalt not kill".
10. I share the dream of Dr. King, for an America (and a world) where people of every color and creed dwell together in peace and mutual respect. Religion should serve as a bridge and not as a barrier.