Ah well I'm half-Mexican and my papers show my family arrived from Spain in Mexico in 1535.
My American side shows papers landing in Maryland in the 1690s via Scotland.
Still, I would not have the arrogance to tell anyone they don't belong when my own ancestors, despite having arrived before this was even the United States, don't have papers from the people who do belong here.
Now that all said, since my ancestry does include 479 years in Mexico and 324 years in what would become the USA, I suppose I could say to the Johnny-Come-Latelys, that you've overextended your welcome, or everyone could chillax and realize the only ones here today with a legitimate and irrefutable claim on this land are the Native Americans.
Perhaps, so this isn't awkward for everyone, the nativist anti-immigration folk should be quiet and feel grateful they aren't sent away packing or deported. Don't ya' think?