Huh?! No one thinks Indians oppressed the Pilgrims or other European invaders. Except the makers of this racist video, perhaps.
In other words, because of the US Constitution, tribal sovereignty, the Indian Gaming Regulatory Act, and various democratic votes to allow gambling. You JibJab people are jibjabbering idiots if you think Indians are getting a special benefit that someone, somewhere, has denied you. Tell your state legislature to legalize gambling in your state and you won't have to worry about favorable conditions for Indians.
To protest this video, use JibJab's Contact Us form. For more on the subject, see The Facts About Indian Gaming.