The Monroe Doctrine was initiated in the year 1865 when the U.S. government decided to lend a hand to the Mexicans.
Step-by-step explanation:
In 1833, James Monroe brings out a strong policy statement asking the British colonizers to keep their hands off land in Central and South America and challenging their security in the Western Hemisphere.
The Monroe Doctrine was initiated in the year 1865 when the U.S. government decided to lend a hand to the Mexicans. December 1823, U.S. President, James Monroe states that the colonization of the British will no more be tolerated and should leave away with their puppet monarchs.
It soon turned into a doctrine as a warning to the British to not involve itself with the Central and South American places.