44 john kennedy’s foreign policy differed from eisenhower’s as it was based on the concept of
a) containment
b) good neighbor policy
c) détente
d) flexible response
e) brinkmanship

The idea of "flexible response," initiated by the Kennedy administration in 1961, was to be able to respond to to military aggression in ways appropriate to each situation.  Flexible response meant using conventional weapons and methods as appropriate rather than relying on a nuclear arsenal as the USA's primary deterrent in dealing with adversaries.

This was a reaction over against the brinkmanship that had developed under the Eisenhower administration, with the threat of massive retaliation against anyone who threatened the US.  John Foster Dulles, Secretary of State under President Eisenhower, had developed the strong approach, going further than the containment policy of the previous administration (of Pres. Truman).  In 1956, Dulles described brinkmanship as "the ability to get to the verge without getting into the war is the necessary art."  He wasn't afraid to threaten massive retaliation against communist enemy countries as a way of intimidating them.

- "made the south's economy grow rapidly and a small effect that a lot of people don't know is that it made the more demand of slaves and cotton products. and also new states formed due to plantations growing in size."

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b.

jim crow laws were enacted in northern states.