Final answer:
Hominins expanded into the New World around 2 million years ago, with Homo sapiens populating the Americas about 18,000 years ago.
Step-by-step explanation:
Hominin Expansion into the New World
Hominins expanded widely out of Africa into other areas of the New World close to 2 million years ago. The first hominid fossils appear in the late Miocene, and by 7-4 million years ago, they began to adapt more fully to a ground-based living niche. However, it was not until Homo sapiens emerged that the populating of the Americas began, likely starting around 18,000 years ago.