The united states adhered to a policy of after world war i.

Isolationism; which is a hands off policy in regard toward Europe. The US wanted to build a "Fortress America" and not get involved in European affairs.

Hope this helps!

The United States adhered to a policy of ISOLATIONISM after world war 1.

But foreign governments retaliated with taxes on American goods.

nothing certain is known about what happened, but it seems that the country declined gradually, perhaps due to bad government, or, more likely, due to a series of bad harvests, which resulted in widespread and recurrent famine.

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.