Haven't had my DNA sequenced, but is there such a thing as "100% Indian/Native blood" of any tribe? Let alone a living 100% native of a 15th century tribe? Or is this another one of your zero sum standards that renders another term meaningless? If you're not 100% native then... what? What's your point?
Does one drop of Euro blood make me any less Taino? You some kinda believer in the "One Drop Rule" of classification?
No recognized nation according to whom? Historians would disagree. The Tequesta, Calusa, Jaega, Ais, and others were and are recognized nations.
Don't presume to tell me what we're talking about, when you suggest apples and oranges. You're talking about a legal distinction now, not a genetic one. Make up your mind, is your standard blood or paper?
EDIT: Also, I thought your claim was, "Every American is an immigrant or a descedent of one..."? By that (bull****) absolute standard, if EVERYONE is an immigrant then migrants are too. By definition, the distinction between the two has nothing to do with nations but:
immigrant |ˈimigrənt| noun
a person who comes to live permanently in a foreign country
One who or that which immigrates; a person who migrates into a country as a settler.
migrant |ˈmīgrənt| noun
an animal that migrates.
• (also migrant worker) a worker who moves from place to place to do seasonal work.