The United States economic foreign policy made them successful and prosperous because they had agood combination of isolationist practices which enabled them to not spend money on useless wars or conflicts while at the same time engaging in trade with various nations.
It provided affordable electricity for isolated rural areas. What problems did students and other young people face? They were unemployed (didn't have jobs), they were poor (poverty), they felt hopeless and had loss of dignity (did not respect themselves) and didn't have spending $$.
