The Monroe Doctrine was necessary because it kept the United States free of any foreign nation. The Monroe Doctrine was a United States policy initiated on December 2, 1823. It stated that further efforts by European nations to colonize land or interfere with states in North or South America would be considered acts of aggression requiring the participation of the United States. At the same time, the doctrine provided that the United States would not intervene either in existing European colonies or in the internal concerns of European countries. The Doctrine was published at a time when almost all of the Latin American colonies of Spain and Portugal had gained or were about to gain independence from the Portuguese Empire and the Spanish Empire; Peru consolidated its independence in 1824 and Bolivia would become independent in 1825, leaving only Cuba and Puerto Rico under Spanish rule. The United States, in agreement with Great Britain, wanted to guarantee that no European power would gain a foothold. Say no to plagiarism. Get Custom Essay on “Why Violent Video Games Should Not Be Banned”?Get Original Essay The Monroe Doctrine was considered protective after seeing Napoleon conquer Europe. This was to protect what they currently had and effectively try to prevent future wars. The Monroe Doctrine held firm for more than a century. Its main goal was to liberate the newly independent colonies of Latin America from European powers and to avoid difficult situations that could turn North America into a battleground for Old World powers in a race for earth. With the Doctrine in place, the United States could exert its own influence undisturbed. The doctrine held that the New World, or the Americas, and the Old World, that is, Europe, should remain separate spheres of influence, because they were composed of entirely distinct and independent nations. The United States could not issue a joint statement with England; Even though England stressed that they had the same ideas at heart, that really wasn't the case. They offered Mexico approximately five million dollars for present-day Texas, which would have been in direct defiance of the Monroe Doctrine. By issuing the Monroe Doctrine, he kept Europe out and kept America for the Americans..