America made some efforts to secure the Peace on the whole planet. Neutrality Acts and other efforts were made to ensure that no other state would become more powerful than America. This worked only limited, due to the ignorance of some big, powerful countries.
In 1929, the USA suffered the most serious depression in its history, with worldwide repercussions. The crisis was caused by the reduces purchasing power of nations weakened by war, and by the failure of debtor countries to pay in fold or through exports, which were made impossible by the high US tariffs. The stock market crash in 1929 wiped out many fortunes and bank failures destroyed savings. Unemployment reached staggering proportions (14 million), leading to hunger parades and rent strikes.
Also a rising racism to foreigners because of the willingness of foreigner to work for low wages led to Exclusion Acts, barring Chinese labour, and an agreement with Japan. The immigration levels were cut extremely, especially immigrants from developing and poor countries had no good chances to come to America.
During this Period some American states introduced the Prohibition to control crime and to give all people in this Period of time a secure feeling. But this was not very efficient and international crime organizations, e.g. the Mafia got even more powerful through trading with illegal stuff.
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