Isolationist Manhattan and Isolationist America began right after WWI, when American voters rejected the League of Nations, rejected the idea of the whole world working together as a team, giving their 110%, to solve conflicts and prevent war.
In the mid 1920s, America erected an anti-immigration Big Gate in New York harbour, to keep all sort of darkish people out.
Emma Lazarus's Big Tent Manhattan faded, replaced by Gordon Gekko's Gated Manhattan.
Soon refugees from Hitler's terror were also being kept out, as American Isolationists (the majority of the American population) worked overtime to appease Hitler, Stalin, Mussolini and Tojo.
Medical Isolationists was also strong trying to defeat Social Medicine on every front.
Basically because Social Medicine advocates, people like Dr Martin Henry Dawson, fundamentally see no borders, trying to help those in need where ever they might be, totally anathema to Isolationists and Appeasers.
Wall Street was even worse on the appeasement front, happily selling Hitler the technology and parts he needed to build his Amerika bomber and A9/A10 to bomb.... Wall Street.
No,isolationist capitalism won't ever bury itself ---- but bomb itself ?