Reply #14: First, why does the person's race matter?

[Igel]

The ancestors of Native Americans immigrated legally, after all. Even the Eskimos, relative late comers.

The very first immigrants in the New World were probably completely swamped by later arrivals, but while the first arrivals may have resisted they lost, either by war (albeit fought in thousands of small skirmishes over millennia) or through being demographically outnumbered and assimilated. In any event, immigration via invasion and genocide through great demographic growth was a time-honored right.

Which gets to the second point: "Legally." If there's no immigration policy--and there wasn't for a long time--then it was legal. Assuming the usual American POV that what's not against the law is legal, as opposed the flip POV, unless it's allowed by law it's illegal.