President Donald Trump’s public frustration with the North Atlantic Treaty Organization, or NATO, over the refusal of fellow members to support the U.S. war effort has reached boiling point, with the president issuing threats to leave the transatlantic military alliance. The alliance of 32 countries, which Trump has described as “severely weakened and extremely unreliable” in a Truth Social post, was established in 1949 at the end of World War II to provide for the collective defense of North America and Europe. The president has referred to the security coalition as a “paper tiger,” prompting speculation over whether the U.S. will abandon its long-held leadership role in the organization.
What would happen if the U.S. left NATO? Having created the treaty alongside Canada, the United States is deeply embedded in NATO’s structure in ways that would be difficult to unwind without fundamentally reshaping how the alliance operates, experts say. Without the world’s superpower providing the bulk of its military firepower and command structure, its combined military strength would be significantly weakened, its political cohesion strained and its deterrent power called into question, they say.
