Glaciers melt, causing the land link the Native Americans crossed to become submerged underwater (estimation) (dec 23, 11971 BC – jan 1, 0)
Description:
As the climate warmed, they faced a food crisis as the immense animals they hunted, including woolly mammoths and giant bison, became extinct.Added to timeline:
Date:
dec 23, 11971 BC
jan 1, 0
~ 1000 years