Why did the United States end its long history of isolationism after World War II? Would it have been possible for the US to return to an isolationist foreign policy

While avoiding the conflict until 1941, World War II marked a turning point for American isolationism. As Germany and Italy swept through Europe and North Africa, and Japan began taking over Eastern Asia, many Americans started to fear that the Axis powers might invade the Western Hemisphere next. By the end of 1940, American public opinion had started to shift in favor of using U.S. military forces to help defeat the Axis. hope this helps.

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most people now work in jobs where they do one  kind  of work; they are carpenters, bankers, cooks, mechanics, and so forth. likewise, most  businesses produce  only certainkinds  of  goods  or  services, such as cars, tacos, or gardening  services. this feature of  production  is known as specialization.