Regions are always defined by

A region is an area of land that has common features. A region can be defined by natural or artificial features. Language, government, or religion can define a region, as can forests, wildlife, or climate. Regions large or small are the basic units of geography.

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C. Many different factors

Explanation:

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the us hoped to prevent any nations from leaning towards soviet union-based communism. the containment policy was established in hopes of keeping communism from spreading to new places.

to extend a country’s power and influence