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  America timeline
     
c. 30,000 years ago
 
Narrative history in HistoryWorld    
With the sea level falling, a land bridge (known as Beringia) forms between Siberia and Alaska, enabling humans to enter the continent of America      
Mount Susitna, in the west of Alaska


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c. 15,000 years ago
 
Narrative history in HistoryWorld   
The La Brea tarpit in Los Angeles shows signs of human activity in the region     
c. 5000 BC
 
Narrative history in HistoryWorld   
Squash and chili are the first plants to be cultivated in America, in the Tehuácan valley in modern Mexico     
Red and green chili peppers


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c. 3000 BC
 
Narrative history in HistoryWorld    
The llama and the alpaca, two south American members of the camel family, are domesticated      
c. 2500 BC
 
Narrative history in HistoryWorld    
At Huaca Prieta, the earliest known farming community in South America, squash, gourds and chili are cultivated      
c. 2000 BC
 
Narrative history in HistoryWorld    
Medicine men in Peru practise trephination, cuttting holes in the skulls of brave or foolhardy patients