In what way did Theodore Roosevelt greatly influence America's change from isolationism?

Theodore Roosevelt significantly influenced America's shift from isolationism through his assertive foreign policy, particularly exemplified by the Roosevelt Corollary to the Monroe Doctrine. He believed in the United States' responsibility to act as a global power, intervening in Latin America to maintain order and stability. His role in negotiating the end of the Russo-Japanese War earned him the Nobel Peace Prize and showcased America's emerging diplomatic influence. Additionally, his efforts in building the Panama Canal further emphasized America's commitment to expanding its presence and influence on the world stage.