Can someone answer these questions? ?

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

Was the civil war inevitable? could anything have been done through compromise to stop it, or did it have to happen?

Approximately how many americans, from both the north and the south, were killed in battle during the civil war?