Answer:
One of the first problems arose with prohibition which led to a devaluation of alcohol. As well as other laws led to continuous devaluations. With the policy of protectionism, the United States ended up falling into a crisis of overproduction. So there were inflations, the smuggling that became more and more important in the trade. America initially had to abandon investment in European industries. The American man of the '20s lived a day, regardless of tomorrow. The great crisis will bring this population back down to earth.
Sorry for the english, i'm italian.
