Why doesn't it require a constitutional amendment to achieve constitutional change?

A constitutional amendment is a modification of the constitution of a polity, organization or other type of entity. ... Most constitutions require that amendments cannot be enacted unless they have passed a special procedure that is more stringent than that required of ordinary legislation.

Explanation:

the monroe doctrine is the best known u.s. policy toward the western hemisphere. buried in a routine annual message delivered to congress by president james monroe in december 1823, the doctrine warns european nations that the united states would not tolerate further colonization or puppet monarchs.

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explanation: