Cultures like Buttermilk Creek, Toca de Tira Peia, and Pedra Furada date near 5-11k years older than the Clovis culture. Yet sometimes are "among fierce debate" (according to wiki) about the authenticity of their dating. We've found evidence that are inhabitants older than clovis, yet clovis is still cited as the oldest human inhabitants in the America's. Given all the evidence stating otherwise, why?