The third answer!
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Communities with war industries experienced an immediate labor surplus when those industries closed down, and the large numbers of returning soldiers added to the unemployment problem.
Positive--resulted in the lowering of the voting age to 18, contributed to the end of the Vietnam War, contributed to furthering the civil rights movements of the time.
Negative--they were violent and led to the deaths of many in riots and shootings, their means were not taken seriously by adults and conservatives of the time,
The colorado river formed the grand canyon
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