Final answer:
The Bering Land Bridge, known as Beringia, is the topographic feature that facilitated the peopling of the Americas after the LGM.
Step-by-step explanation:
The topographic/geographic feature that facilitated the peopling of the Americas after the Last Glacial Maximum (LGM) is known as Beringia, commonly referred to as the Bering Land Bridge. This land bridge connected Asia to North America and is believed to have been used by the first inhabitants of what would become the Americas who migrated in search of food. As the glaciers melted and sea levels rose, Beringia was submerged, creating the Bering Strait.
This migration route was part of a broader process that included coastal migration, where some groups are theorized to have followed the coastlines of Asia and North America, potentially by boat, to reach South America as supported by archaeological evidence from sites predating those of the Clovis culture.