What were the four main points of the monroe doctrine?

(1) The United States wouldn't interfere in the internal affairs of or the wars between European powers; (2) The United States wouldn't interfere with existing colonies and dependencies in the Western Hemisphere; (3) The Western Hemisphere was closed to future colonization; (4) Any attempt by a European power to oppress or control any nation in the Western Hemisphere would be viewed as a hostile act against the United States.

its many islands, high mountains, and remote peninsulas isolated population centers.