False: First Americans Came by Boat from Japan Across Pacific Strait

False. The prevailing scientific consensus supports a different narrative:

Bering Land Bridge Theory (Consensus)

• Route: Beringia – exposed continental shelf connecting Siberia and Alaska during Last Glacial Maximum (LGM, ~26,000–19,000 ya) when sea levels were ~120 m lower.
• Timing: Primary migration 15,000–13,000 years ago (ice-free corridor / coastal route). Pre-Clovis sites (Monte Verde, Chile 14,500 ya; White Sands, NM 23,000 ya footprints) push earlier.
• Ancestry: Ancient North Siberians → Ancient Paleo-Siberians → Native Americans. Genetic continuity confirmed (ancient DNA).
• Not Japan: Jōmon people (Japan) share deep ancestry but are a sister branch, not direct ancestors. No evidence of trans-Pacific boat migration in Pleistocene.

Coastal Migration Hypothesis (Complementary)

• Kelp highway: Boats along Beringia's southern coast → Pacific Northwest → Americas.
• Still originates from Beringia/Siberia, not Japan across open Pacific.
• Requires watercraft capability (likely), but short hops, not ocean crossing.

Why the Japan Idea Persists

• Jōmon pottery similarities to Valdivia (Ecuador, 3500 BCE) – once hypothesized contact; now considered independent invention or much later (Jōmon sailors could ride Kuroshio, but no genetic trace).
• Ainu phenotype misinterpreted as "Caucasoid" → speculative trans-Pacific theories.
• Thor Heyerdahl's Kon-Tiki (1947) proved drift possible, not that it happened.

Bottom Line

First Americans came from Siberia via Beringia (land and/or coast), not Japan across the Pacific. The "Pacific Strait from Japan" narrative contradicts genetics, archaeology, paleoclimate, and linguistics.