Where did the "native" american Indians come from? They came from somewhere. They just didn't pop out of the ground and presto.
Leftists are only trying to justify the illegal aliens who keep pouring in here because they are so immensely important to their progressive agenda with that being the eradication of the white Christian European culture that founded and nurtured the nation.
Do you actually know where they came from, or is this an honest question? Based on your other comments on this forum, I'm guessing it's the latter, so here's your answer:
Prior to what became as "American Indians" or "Native Americans," crossing an ice-age land bridge the west (far east) and the area now known as Alaska, there were no humans living on the North American continent, and that human migration happened no less than 13,000 to 14,000 thousand years ago (roughly 12,000 years before the events of the New Testament of the Christian bible, to give timeline perspective).
The first Europeans to hit the continent were Western Norse Vikings, who landed in Canada somewhere around the 11th century CE. While Vikings are pretty cool (who doesn't like Vikings?), their stay was fairly brief and serious colonization of the continent didn't kick in until well after Columbus accidentally found it in 1492.
Since they were here for over 10 centuries before the Europeans and there were no other humans here prior to their arrival, they are considered "indigenous people," as they were here long enough to be actual natives.
The time your family and mine have been here is fairly insignificant to the time pre-biblical humans have been here. They're natives. We're not. At least, not in the sense you mean.