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During the 17th and 18th centuries, the frontier for the British colonies of North Americas could usually be found at the:

Aedge of the Atlantic Ocean
BAppalachian Mountains
Cborderline where French and Spanish territories began
DContinental Divide

Verified Answer :

During the 17th and 18th centuries, the frontier for the British colonies of North Americas could usually be found at the "b. Appalachian Mountains" since this was the area that most settlers were not inclined to pass.

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