What was the name of the policy, announced in 1823, declaring that European powers should no longer colonise or interfere in the affairs of the Americas?

• A Truman Doctrine
• B Roosevelt Corollary
• C Manifest Destiny
• D Monroe Doctrine ✓

The Monroe Doctrine, articulated by President James Monroe, asserted that the Western Hemisphere was closed to future European colonisation and became a cornerstone of foreign policy.