Is focusing on something specific in the environment

Your answer is Attention.

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ans is The reduction of British aid to Native Americans near the Mississippi River made white settlement easier.

Explanation:

from a previous ans on :

1- During the War of 1812, many native tribes collaborated with the British in exchange for economic aid and resources.

With the British defeat, the natives, who had been the main contenders of the Americans in the fighting (losing 10,000 men) were weakened in their position in their territories, to such an extent that those territories were effectively occupied and organized by representatives of the U.S.

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