What led the US to move from isolation to international involvement in the 1940s Help please

What was a consequence of people migrating from the rural areas to the city? a. homesteading b. bans on immigration c. melting pot d. slums

In a planned economy, which of the following does the job of market forces in order to determine the outcomes?

Congress could only request money and had no power to tax; each state made its own money; there was no national court system. which one of these weaknesses do you believe was the most important to correct?