The 13th, 14th, and 15th, Amendments to the Constitution were undermined by all of the following except Brown V. Board of Education is your answer. Hope this helps! :)
~Shadow
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The Navigation Acts<span>, while enriching Britain, </span>caused <span>resentment in the colonies and were a major contributing factor to the </span>American Revolution<span>.</span>
The Japanese were more willing to surrender than the U.S. military thought.
The real answer.
The Farming of plants was a turning point in human history. Ths allowed larger civiliations and the first empires to emerge. Also, technical advances were possible because people could specialize in one subject, such as mathmatics, due to calorie surplus, a.k.a farmers making more foo than they need for themselves.