American foreign policy, according to the text, tends to alternate between
a. cold wars and hot wars.
b. idealism and realism.
c. bipolarism and multilateralism.
d. interventions and isolationism.
e. realism and existentialism.
American foreign policy tends to alternate between "d. interventions and isolationism" since the US has historically been an isolationist nation, although it has been compelled to enter several wars.
