Born into a planter family in Westmoreland County, Virginia, Monroe served in the Continental Army during the American Revolutionary War. After studying law under Thomas Jefferson from 1780 to 1783, he served as a delegate in the Continental Congress. As a delegate to the Virginia Ratifying Convention, Monroe opposed the ratification of the United States Constitution. In 1823, Monroe announced the United States' opposition to any European intervention in the recently independent countries of the Americas with the Monroe Doctrine, which became a landmark in American foreign policy. He attended this school only 11 weeks a year, as his labor was needed on the farm. During this time, Monroe formed a lifelong friendship with an older classmate, John Marshall. Monroe's mother died in 1772, and his father two years later. Though he inherited property from both of his parents, the 16-year-old Monroe was forced to withdraw from school to support his younger brothers.
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