I take exception to the statement that slavery came to America with Europeans. There is ample evidence of slavery here prior to that point. And, before anyone pounces, I do have some Cherokee and Creek ancestry, so it's not as if I stand to gain anything from stating this. Facts are facts, and overly sentimental, positive stereotypes also tend to reinforce negative ones as well.
"The situation of enslaved Indians varied among the tribes. In many cases, enslaved captives were adopted into the tribes to replace warriors killed during a raid. Enslaved warriors sometimes endured mutilation or torture that could end in death as part of a grief ritual for relatives slain in battle. Some Indians cut off one foot of their captives to keep them from running away; others allowed enslaved captives to marry the widows of slain husbands. The Creek, for example, treated the children born of slaves and tribal members as full members of the tribe rather than as enslaved offspring. Some tribes held captives as hostages for payment. Other tribes practiced debt slavery or imposed slavery on tribal members who had committed crimes; but this status was only temporary as the enslaved worked off their obligations to the tribal society."
http://www.slaveryinamerica.org/history/hs_es_indians_slavery.htm