The most heated point of protests for the Vietnam War was 1967-68. Vietnam aggression got really bad in the later 60's until the United States pulled out in the early '70's. Although there was conflict with Vietnam through the '40's and '50's, it was in the 1960's when Vietnam got heated.
the answer is spheres of influence.
Comprimise of 1850, Missouri Comprimise
The answer would be, to support a cause
Classical civilizations were mainly empires, so that is special
