How would america view a european nation's attempt to further colonize any area in the western hemisphere?

According to the Monroe Doctrine the United States would look at any attempt by European nations attempt to colonize the Western Hemisphere as a hostile action towards America.

Explanation:

Named after James Monroe, the Monroe Doctrine was his policy of complete opposition to any colonialism by European countries in North and South America.

As a policy, it was one of the longest standing policies in the US history which was endorsed by several American Presidents.

This policy eventually gave rise to a political thought among US politicians that believed South America to be their 'backyard'. This eventually resulted in the US, meddling in the affairs of many countries over there.

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