The correct answer is - crimes against humanity.
Both, the Cambodians and the Turks, made genocides that were in the most brutal way, and they were a prime example of crimes against humanity. Innocent people were killed because of the twisted, sick ideologies of the leaders of the two countries, were even babies were brutally murdered. While the genocide under the leadership of Pol Pot in Cambodia, is accepted throughout the world as one of the worst actions against humanity, the genocide that was committed by the Turks over the Armenians is still kind of in the background, and is not even mentioned, like it never happened, even though it was a genocide that was more devastating to the Armenian population than the loss the Jews had when there was a genocide over them by the Nazis.
There were many ways! But, here's a few; for you to choose by!!
1) Disputed between Congress and the president (Johnson and his 10% plan, and impeachment)
2) The passing of Black Codes, Jim Crow Laws, Literacy tests, poll tax, and grandfather clauses- all limiting rights of African Americans
3) Less of an enthusiasm placed on Reconstruction with the passing of Henry Clay and Webster
4) The establishment of sharecropping and tenant farming very similar to slavery
Hope this Helps ;)
The fact that the landscape was primarily flat, with a warm/dry climate meant that many Native Americans relied on farming, and because there was a lack of domesticatable plants and animals, they relied on specific foods to survive.
The Mughal Empire ruled over a population that was mostly non-Muslim.