Monroe Doctrine

From Conservapedia

The Monroe Doctrine was a declaration made by President James Monroe to Congress on December 2, 1823, claiming that the Western Hemisphere was now "off limits" to European powers by saying that no new colonies could be established in the Americas. It also stated that the US would remain neutral in affairs between these powers and their existing colonies, unless these conflicts occured in the Americas.

Although the Doctrine is named after James Monroe, it was chiefly created by his Secretary of State, John Quincy Adams.

References

http://usinfo.state.gov/usa/infousa/facts/democrac/50.htm