Is the U.S. Justified in Considering a North American Alliance Doctrine? Since World War II, the U.S. has been the backbone of global security through NATO and other alliances, spending 3.4–3.7% of GDP ($778–968 billion annually, 2020–2024), enabling allies like Japan (1.4% GDP) and Germany (1.8%) to prioritize economic growth. Frustration over NATO allies’ underfunding—only 11 of 31 met the 2% GDP target in 2023—has spurred interest in a North American alliance with Canada, Greenland, Mexico, and Central American states. This doctrine could secure the Arctic, counter drug cartels, and reduce U.S. defense costs ($150 billion annually for 700 overseas bases). Canada benefits from low spending (1.5% GDP), Greenland leverages strategic relevance, and Mexico strengthens USMCA trade. However, reducing NATO commitments risks weakening global deterrence, emboldening Russia (7.1% GDP, $149 billion) and China (1.7%, $314 billion), and disrupting $18 trillion in U.S. exports, potentially cedin...