How did William McKinley invoke the Monroe doctrine?

William McKinley invoked the Monroe Doctrine primarily during the Spanish-American War and the subsequent conflict over Cuba. He used it to justify American intervention in the Western Hemisphere, asserting that European powers should not interfere in the affairs of Latin American nations. This invocation reinforced the U.S. position as a dominant regional power and aimed to prevent European colonial expansion in the Americas. McKinley’s actions were part of a broader strategy to assert American influence and protect U.S. interests in the region.