Which issue was resolved by the us civil war

In shifting to a defense policy based upon the concept of "flexible response," president kennedy was indicating that he had grave doubts about thevalue of which previous defense policy? a massive retaliationb collective securityc containmentd air power

How were castas paintings used to stabilize a society?

What happened in the tinker v des monies? and why is it important what happened in the hazlewood v. kuhlmeier? why is it important?