Explain What Was The Main Purpose Of The Monroe Doctrine

According to the findings of Historian Dexter Perkins, the main purpose of the Monroe Doctrine, or the non-colonization principle, was a foreign policy that was intended to stop European colonization in the Western Hemisphere. President James Monroe established this doctrine in a speech to Congress in 1832.
While the doctrine is named after the President that wrote the 1823 message to Congress, the Monroe Doctrine was originally the idea of Secretary of State, John Quincy Adams. Two main events convinced Adams that such a Doctrine was necessary. First, The Russians built Fort Ross close to Spanish San Francisco and the Czar in 1821 ordered foreign ships to stay 100 miles clear of Russian American shores. The second, yet more important problem Adams saw, was the chance that Austria and France would send troops to the Western Hemisphere to help Spain regain her lost colonies in South America,
Not only that but Americans wanted to defend their new-found Democracies from European monarchies. The Monroe doctrine was able to be defended because England, fearing that other European powers such as Russia and Germany, could become stronger than it by having colonies, also heavily supported it.
The Monroe Doctrine stated that further efforts by European nations to take control of any independent state in North America would be viewed as "the manifestation of an unfriendly disposition toward the United States.” At the same time, the doctrine noted that the U.S. would recognize and not interfere with existing European colonies nor meddle in the internal concerns of European countries.
The Monroe Doctrines stated objective was to free the independent colonies of North America from European intervention. Also, to avoid situations which could make the New World a battleground that the country could ill afford economically after the damages caused by the War of 1812 as well as the Mexican-American