Because of Columbus I and most of Latin Americans are born, most of us are a mix of European and Native Americans. If all of that population was really killed, there would be just white people in the spanish and portuguese territories.
Ignoring the rest of your comment… how would this kill you all?
My point was that the population was not exterminated in this side of America, the proof is us (Latin Americans), for example Mexico with 90% of its population being "mestizo" (european/native american) with variations of 70%/30% 50%/50% 30%/70%