Why is it so difficult to understand when the native americans crossed the bering straits?

1) because first new world humans left little way of archaeological record until clovis peoples. not preclude earlier presence, clovis people produced distinct industry of stone tools, including large, fluted spear points (which notably conspicuous). other records (including bone) far more perishable.
2) biogenetic studies make clear first peoples of americas, presuming modern native populations descendants of first arrivals, came siberia, measurements provide imprecise, yielding ranges of 25,000 years (ie 50 - 25 ka bp).
3) advance , termination of last glacial maximum have erased evidence way of glacial action or sea level change.

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