**Select all that apply.**
^ MULTIPLE ANSWERS ^

Americans disagree about the lessons of Vietnam. The lessons learned include _____.

a. the U.S. should not attack countries that do not pose a direct threat
b. if the U.S. starts a war, it should not place limits on its military power
c. the North Vietnamese could not be defeated because their military was more powerful than the U.S. military
d. that military tactics must be adjusted to meet the particular circumstances of each war