During James Monroe's presidency, the United States faced several important challenges with other countries. Monroe had already settled a dispute with Spain through the Adams–Onís Treaty. Even so, important foreign policy challenges remained. His response to these challenges would become the defining achievement of his presidency.
By the early 1820s, many Latin American colonies had declared independence from Spain and Portugal. Monroe and his advisers worried that European countries might try to retake these colonies or establish new ones in the Western Hemisphere. American leaders worried that growing European influence near the U.S. might threaten its security, trade, and independence.
In 1823, Monroe addressed these concerns in his annual message to Congress. Part of that speech, written by Secretary of State John Quincy Adams, later became known as the Monroe Doctrine. It warned European countries not to create new colonies or interfere with independent nations in the Americas. In return, the United States promised to stay out of European wars. The United States also agreed not to interfere with existing European colonies.
The Monroe Doctrine aimed to keep European political conflicts out of the Western Hemisphere. It showed the growing confidence of the United States. The policy declared that the United States had an important role in protecting its own interests. It also supported the independence of countries in the Americas. The Monroe Doctrine redefined the United States' role in the world. It told European countries that the United States expected respect for its growing influence in the Western Hemisphere.
Still, the policy had limits. The United States was not yet strong enough to force European countries to obey the Monroe Doctrine. However, Great Britain also wanted the new Latin American nations to remain independent so it could trade with them. Britain's powerful navy helped prevent other European countries from trying to retake those colonies.
The Monroe Doctrine became an important statement of American foreign policy. It changed how the United States viewed its place in the world. It also shaped relationships with countries across the Western Hemisphere for years to come.
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