USA HISTORY

Detailed explanation-1: -In the late 1800s, U.S. economic and military power enabled it to enforce the Monroe Doctrine. The doctrine’s greatest extension came with Theodore Roosevelt’s Corollary, which inverted the original meaning of the doctrine and came to justify unilateral U.S. intervention in Latin America.

Detailed explanation-2: -But since European meddling threatened British as well as American interests, the Monroe Doctrine was enforced by the Royal Navy.

Detailed explanation-3: -The doctrine provided Canada with a de facto security guarantee by the United States; the US Navy in the Pacific, and the British Navy in the Atlantic, made invading North America almost impossible.

Detailed explanation-4: -Great Britain was a supporter of the American diplomatic statement known as the Monroe Doctrine of 1823. The British had suggested making the doctrine a joint British-American initiative, although U.S. Secretary of State John Quincy Adams decided to make the policy a unilateral statement.