Today in History, December 6, 1904:
The Roosevelt Corollary to the Monroe Doctrine. The Monroe Doctrine had been established to tell European powers to stay out…no Emperialism in the Western Hemisphere. When it was declared, the US didn’t really have the forces to back it up. But, conveniently the Royal Navy agreed and enforced it for their former adversaries.
In 1904 President Roosevelt made an addition to the Doctrine. There had been recent incidents in which European powers threatened actions against South American nations that they felt owed them money. In his annual message to the Congress, TR stated that, should any developing nations in the Western Hemisphere require intervention due to unrest or an inability to handle their financial affairs, it would be the US that would intervene, not foreign nations. This time TR had the Navy to back it up.
Many criticize Roosevelt’s assumption of police powers in the Americas as expansionist, and with the events surrounding the building of the Panama Canal, there is likely some validity to that view. However the primary objective was to ensure that foreign powers knew the US would not tolerate their use of military force in our backyard. And it kept the big kids from taking advantage of the still developing countries in the Western Hemisphere.