Argentina is 75% pure Amerindian and the remaining 25% is Spanish+AMERINDIAN. Note, Mestizo: Mostly Amerindian, tiny drops of Spaniard.
It's more, Argentinian culture is overwhemengly Amerindian in all aspects, here an example of the Amerindian dominance in all aspects, genetical and cultural in Argentina:
*metizo see note.
Gauchos? Mestizo Asado? Mestizo Chimichurri? Mestizo Sun of May (the sun in argentina's flag)? Incan diety Mate? Native American (GuaranĂ) Tango? African (not european, checks) Most spoken languages besides Spanish? They are all native Architecture? Mostly Amerindian Appearance of most Argentines? AMERINDIAN. Best football player of Argentina's history? Mestizo Majority of Argentina's population? Mestizo
Conclusion: Argentina has always been, is and will forever remain and Amerindian nation under la Pachamama.