 The entire theory concerning the first inhabitants being the Clovis culture was reevaluated following the discoveries at Cactus Hill in the mid-1990s.With the emergence of new evidence, the hypothesis for a pre-Clovis human occupation began to surface.A 2008 DNA study suggested "a complex model for the peopling of the Americas, in which the initial differentiation from Asian populations ended with a moderate bottleneck in Beringia during the last glacial maximum (LGM), around approximately 23,000 to approximately 19,000 years ago.