【疑似背景】10年2月RC第14篇：抵达美洲的方法，请NN确认~ - ChaseDream

Who were the "first" Americans!

The question of when people first reached the Americas has been ongoing to anthropologists and archaeologists. For a long time, scientists have believed that humans first entered the continent about 14,000 years ago across the Bering Strait in Alaska from Siberia at the end of the last ice age when enough ice had melted to allow passage but before the area was flooded. This Bering Land Bridge theory has been the most upheld belief to date and has a lot of evidence in its favor. The oldest archaeological sites found before recently are scattered throughout the US and all date to about 13,000 years ago. The weapons and tools found at all of these sites are very similar and since the all the people likely shared a common culture, archaeologists have dubbed them the "Clovis" people, after a site in Clovis, New Mexico.

Recent research in the eastern US and South America has revealed sites that set the date of human arrival much farther back, possibly as far as 20,000 to 30,000 years ago. Monte Verde, a site discovered in Chile in 1993, dates to 14,700 years. If humans entered North America through Alaska and constantly moved southward everyday, which is not likely, it would take at least a thousand years to get to Chile, most likely more. This site outdates the Bering Land Bridge theory and proves that at least some of the first American people had to arrive another way.

A new theory that has arisen due to the findings of these older sites is the Pacific Coastal theory. Anthropologists speculate that sea faring people from Asia sailed up the Asian coast during the Ice Age, following the glacier that covered the northern areas, and around to the Pacific coast. This theory is very plausible; humans used oceanic boats as long as 40,000 years ago. But the theory is not easy to prove. In the past 13,000 years, due the end of the last Ice Age and the subsequent melting of all glaciers, the sea level has risen quite bit, and what were the coastal lands during that time are now sunken deep under water. A few expeditions have pulled tools around 10,000 years old from the ocean around the Pacific coast so we do know that humans were living there. There is little other evidence though to suggest who they were.

14 抵达美洲的方法[附考古]

V1 by cindytim

讲一个很多学者以前都认为最早到达美洲的人是在冰川时代乘船来得，有后来怎么撤到步行。第二段就是说了很多假设说步行的怎么要多久多久了，至少好像要100年走多少mile啥的，后来还是否定了步行，说他们是坐船来的。有主旨题。第二段全highlight了，问作用。

V2 by 纹舞千瞳

关于美国历史，如何考证美国最早是什么时候有人的还是被发现的……一页多~看得我晕晕呼呼地, 人类何时到达美洲，还有不确定。考古的发现显示的最早时间的14,700年前。然后说是什么通过美洲大陆上或是海底里最古老的遗址来确定什么，好像有个15,000到15,500的数字题~

考古 [已确认]

V1

人类何时到达美洲(也许是南美洲)，还有争议。考古的发现显示的最早时间的14,700年前。第一个假说是，通过陆路。因为独木舟(kayak)太小不太可能做跨海的交通工具。由于ice age，人类不可能于15,700年前通过陆路到达美洲(讲了原因“冰呀，海呀什么的”)。还讲了什么向南走，一个月可以走20里。多少年后到了南美。第二个假说是，通过海路。但没有证据。由于ice age结束后海平面升高，即使有证据也被淹没了。到海底去挖掘有不太可能。所以还是没有结论。