An ethnic genocide, for one.
This means that a certain ethnic group was basically wiped out in that country/state. In the Holocaust, it was the Jews.
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Answer:
Because there was a debate about whether or not slavery should be legal
Explanation:
Pyramids were built for the burial of Egypt's ruler. Many workers were hired for its building, it took at least 30 years to build one pyramid, so there were many workers and engineers.
They believed that it was unlawful to force children to attend public schooling when their parents might not want it, and saw it as an infringement of rights. Furthermore, many children were home schooled at the time, though this trend was declining, so public school wasn't seen as so much of a necessity.