https://quillette.com/2019/12/05/tensions-in-nato-and-the-looming-end-of-pax-americana/
As NATO leaders gathered in London this week to mark the 70th anniversary of history’s most venerable military alliance, it has been widely forgotten that not so long ago the specter of armed conflict haunted the European continent. When the Washington treaty establishing NATO was signed in April 1949, the Soviet Union occupied the captive nations of Eastern Europe and an invasion of Western Europe by the Red Army was not a remote possibility. On current trends, the Atlantic alliance may well suffer a premature demise as the world moves into another great power rivalry that is also an ideological contest between democracy and autocracy.
A terse review of the historical record is in order here. In the aftermath of World War Two, the United States committed itself to a revolutionary foreign policy. The extraordinary task of maintaining some semblance of international order after two global conflagrations was premised on a controversial but compelling notion of enlightened self-interest. The guiding principle of U.S. statecraft was that the peace of the world was in grave and permanent jeopardy, and thus that it needed to be imposed and kept by force, or at least the credible threat of it. This momentous undertaking required that American power remain second to none, and for it to be deployed in outposts far from the American mainland. It was only through this forward engagement, providing moral and material succor to vulnerable allies and international norms, that would prevent a breakdown in order that would draw the world into yet another violent maelstrom.
America’s reluctant but immense decision to take the lead in upholding a decent international order did not enjoy a long honeymoon. It rapidly came under ferocious challenge by Soviet power pressing to extend its imperium from Berlin to Baghdad, from Helsinki to Havana, and from Seoul to Saigon. The containment doctrine that flowed from the novel understanding of America’s self-interest aimed to thwart Soviet expansion. The North Atlantic Treaty Organization, set up in 1949 as a key pillar of containment, upheld the principle of anticipatory self-defense. However, the “self” that was being defended, as was pointed out by isolationists of the day, was not exactly the American homeland, but the sovereignty of American allies and the security (as well as the prevalence) of the American way of life.