There was no "holocaust", The numbers were already increasing by the time the US became a country and it has been rising ever since.
If you actually knew anything instead of repeating lies by others, the "population crash" was between 1495 and 1620. And it was caused by disease.
However, even that is misleading, as it is believed the highest population was actually before 1450, when the Mississippian Culture collapsed. The fragmentation and collapse of that culture came after about 2 decades of warfare and disease, and started a sharp downward trend in population numbers that was continued by disease after the Europeans arrived. But the "White Man" did not create it, it was already a fact and why so many of the groups they ran into that had been part of the Mississippian Culture were so hostile. As opposed to other groups they met which were friendly, and had never belonged to that culture.
But the deaths of the Indians was no more a "holocaust" done to them than the Black Death was a holocaust on Europeans caused by the Chinese.