In the course of the peopling of the World by Homo sapiens, East Asia was reached about 50,000 years ago (50 kya). The undifferentiated "non-African" lineage of 70 kya diverged into identifiable East Asian and West Eurasian lineages by about 50 kya.[1] This early East Asian lineage diverged further during the Last Glacial Maximum, contributing outgoing from Mainland Southeast Asia significantly to the peopling of the Americas via Beringia about 25 kya.[2] After the last ice age China became cut off from neighboring island groups.