How much did British naval power help enforce the Monroe Doctrine before and after Theodore Roosevelt?
Short answerA significant tacit share, because British enforcement of the same strategic outcome served Britain's own interests.
NotesThe analysis treats enforcement as a shared strategic effect rather than an exclusively American achievement. Royal Navy power discouraged European challenges in the Western Hemisphere before Theodore Roosevelt's presidency. That tacit assistance continued afterward because the policy suited Britain as well as the United States. In this account, British interests and naval capability helped sustain the maritime balance behind the American doctrine.