What was Theodore Roosevelt’s extension of the Monroe Doctrine called? What were its three parts?

(1) the United States would not interfere in the internal affairs of or the wars between European powers; (2) the United States recognized and would not interfere with existing colonies and dependencies in the Western Hemisphere; (3) the Western Hemisphere was closed to future colonization

it was important because it showed that america was a force to be reckoned with during the cold war.