Human Migration to the Americas and Oceania

Primary Theories

1. Bering Land Bridge (15,000–12,000 years ago): Lower sea levels exposed Asia–North America land bridge; Paleo-Indians crossed and spread south.
2. Coastal Migration: Some groups may have followed Pacific coast by boat from Siberia/Northeast Asia.
3. Transoceanic Voyages: Possible intentional/unintentional crossings from Polynesia/Southeast Asia.

Migration to Oceania

Separate from Americas. First settlers from Southeast Asia via Island Southeast Asia ~50,000 years ago. Austronesian expansion reached New Zealand and Easter Island in stages.

These theories are not mutually exclusive; DNA, archaeology, and linguistics continue to refine our understanding.