Answer:
It probably hasn't happened because the theory behind Marxism is wrong. A government can't control the economy efficiently enough for it ever to work well enough for communism to be practical. That's why there are almost no communist countries left today.
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A B And C. I'm learning about the same stuff to lol.
The amendment granted citizenship to "all person born or naturalized in the united states" which included former slaves who had just been freed after the civil war.
So the answer is A
