When did President Monroe and Secretary Adams announce a bold new policy for the Western Hemisphere?

Answer 1

James Monroe issued the "Monroe Doctrine" in 1823. The Doctrine held that any former colony in the Western Hemisphere that had declared independence and successfully became independant (through either war or treaty) would not be re-colonized by the same or a different European power. Although the young United States was in no position to defend this declaration, the British agreed with the sentiment and argued that their navy, the strongest in the world at the time, would defend the Monroe Doctrine.