Theodore Roosevelt

Monroe Doctrine: A principle of US policy that any intervention by external powers in the politics of Americas is a potentially hostile act against the US. Roosevelt Corollary to Monroe Doctrine expanded its interpretation.

Big Stick Diplomacy: The policy pursued by President Theodore Roosevelt to use military force or threat to achieve foreign policy goals.

National Park Service: An agency of federal government which manages all national parks; it was established during presidency of Theodore Roosevelt due to his conservation efforts.