U.S. President James Monroe enunciated the doctrine in 1823, remembered with his name, which is summarized in the first "America for Americans."
After Britain and Prussia defeated Napoleon in 1815, at the request of the Austrian Chancellor Metternich met the Congress of Vienna, from which came the Holy Alliance, an agreement between absolutism in Europe and retrieve the American colonies. The second goal was not achieved, largely by the position of Monroe. This, in a message to U.S. Congress, said that as the American continent had gained freedom, European countries should not be considered colonized territories.
Theodore Roosevelt, the U.S. president who finalized the construction of the Panama Canal, used the Monroe Doctrine to justify its interventionist policy across the continent, called "the big stick" (big stick).
U.S. President established the republican system of America as its own, saying in his message of 1823 that the governance of the European powers, namely the monarchy (not a constitutional or absolute), it is strange to American life.