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In U.S. History, 19th Century use of the term "American Frontier" refers to

A)
the area where pioneer settlement ended.
 
B)
the Atlantic or Pacific coast of North America.
 
C)
the territory east of the Appalachian Mountains.
 
D)
any territory beyond the thirteen original colonies.
 


Sagot :

Answer:A

Explanation:frontiers are borders and borders are where settlers arnt

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