What "may be seen as the final stage in the evolution of American independence"?

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The Monroe Doctrine, established in 1823, asserted that the Western Hemisphere was no longer open to European colonization and that any interference by European nations in the Americas would be seen as acts of aggression. This doctrine is often viewed as a significant step in the evolution of American independence, as it asserted U.S. influence and protection over the Western Hemisphere.

What "May Be Seen as the Final Stage in the Evolution