The Monroe Doctrine was necessary because it kept the United States free from foreign nations. The Monroe Doctrine was a United States policy initiated on December 2, 1823. It stated that further efforts by European nations to colonize territory or interfere with North or South American states would be viewed as acts of aggression, requiring the US involvement. At the same time, the doctrine noted that the United States would not interfere with existing European colonies or intrude on the internal concerns of European countries. The Doctrine was issued at a time when nearly all of the Latin American colonies of Spain and Portugal had achieved or were on the verge of achieving independence from the Portuguese Empire and the Spanish Empire; Peru consolidated its independence in 1824, and Bolivia became independent in 1825, leaving only Cuba and Puerto Rico under Spanish rule. The United States, in agreement with Great Britain, wanted to ensure that no European power interfered. Say no to plagiarism. Get a tailor-made essay on "Why Violent Video Games Shouldn't Be Banned"? Get an original essay The Monroe Doctrine was considered protective after seeing Napoleon's conquest of Europe. It was to protect what they currently had and effectively try to prevent future wars from occurring. The Monroe Doctrine remained strong for more than a century. Its main goal was to liberate the newly independent colonies of Latin America from European powers and avoid difficult situations that could have made North America a battleground for Old World powers in a scramble for land. With the Doctrine in force the United States would have been able to exercise its influence undisturbed. The doctrine held that the New World, or the Americas and the Old World, meaning Europe, should remain separate spheres of influence, since they were composed of completely separate and independent nations. The United States could not issue a joint declaration with England; although England has emphasized that they have the same ideas at heart, in reality this is not the case. They offered Mexico about five million dollars for what is now Texas, which would have been a stark contrast to the Monroe Doctrine. By promulgating the Monroe Doctrine it kept Europe out and kept America for the Americans.