For 10 points, name this man with a namesake Doctrine, who was the fifth president of the United States.
The Hoover administration's Clark Memorandum rehabilitated one of this President's major policy achievements. That policy had actually been authored by his Secretary of State, John Quincy Adams, and was later modified with a famous "corollary" by Theodore Roosevelt. Because of this President's major support for the colonization of Liberia, Liberia's capital is named after him. For 10 points, name this man with a namesake Doctrine, who was the fifth president of the United States.
The Hoover administration's Clark Memorandum rehabilitated one of this President's major policy achievements.
James {Monroe}