The city of Pawnee was incorporated in 1817, when a young man by the name of Reverend Luther Howell came from Terre Haute on an ox. He planted his flag in the ground, and was met soon after by an angry tribe of Wamapoke Indians--who, when seeing the whiteness of his skin, twisted him to death.
It's more likely the Indians would've greeted Howell warmly and treated him as a friend. Until Howell and his people betrayed them and tried to exterminate them, that is.
It seems the liberal Poehler isn't too sensitive to the plight of Indians. She could've made fun of Howell's covetousness, but instead she made fun of the Indians' savagery.
For more on the subject, see TV Shows Featuring Indians.