Final answer:
The best example of the Monroe Doctrine is when President Theodore Roosevelt extended the doctrine in a speech to Congress in 1904, asserting the right of the United States to intervene in Latin American nations as an 'international police power'. This example demonstrated the US' willingness to use force to uphold the principles of the Monroe Doctrine.
Step-by-step explanation:
The best example of the Monroe Doctrine is when President Theodore Roosevelt extended the doctrine in a speech to Congress in 1904. He asserted the right of the United States to intervene in Latin American nations as an 'international police power' in order to collect debts and prevent European involvement in the Western Hemisphere.
Roosevelt's interpretation of the Monroe Doctrine, known as the Roosevelt Corollary, allowed for military intervention to maintain stability and protect US economic interests in the region.
This example demonstrated the United States' willingness to use force to uphold the principles outlined in the Monroe Doctrine.