The answer is B. It was the barrier so to say between communism and capitalism.
D) Anti-Vietnam War Protests
(I think, I've heard them in a movie 2 years ago in my history class)
"Olmec" is the one tribe among the following choices given in the question that was <span>not a tribe of North America when Europeans arrived. The correct option among all the options that are given in the question is the first option or option "A". I hope that the answer has actually come to your help.</span>