It can be inferred rhat sir walter raleigh was unable to establish a succesful colony at roanoke island because

Lack of food and  supplies and problems with the natives.

Lack of food and  supplies and problems with the natives.

The Roanoke Colonies. The Roanoke Colonies were an ambitious attempt by England's Sir Walter Raleigh to establish a permanent North American settlement with the purpose of harassing Spanish shipping, mining for gold and silver, discovering a passage to the Pacific Ocean, and Christianizing the Indians.

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cutting down of the rainforest