The "native Americans" were anything but paragons of environmental virtue. Many tribes were nomadic. They consumed the resources of a location and moved on. The environment recovered because their numbers were small compared to the resources available. If the current population of the United States operated in exactly the same fashion as the original "native American" tribes, we would have a major disaster in short order.
He plays the race card, but fails to acknowledge that it was black tribesmen who sold the slaves to traders in Africa. The individuals were often captive prisoners from skirmishes with nearby rival tribes. He omits that dirty little detail about the number of slave owners who were themselves black. Not politically correct.
Rivers of blood in the U.S.? Try Rwanda and Burundi. The Hutus and Tootsis hacked away at each other with machetes until over 60,000 were dead. The rivers indeed ran with blood and body parts.
Slavery is gone from American soil, but you can find it alive and well in Africa. The Moslems of Sudan keep the Christians as slaves.
The anti-capitalist rant sounds like the product of a lefty high school student.