Shortly after noon on November 22, 1963, President John F. Kennedy was assassinated as he rode in a motorcade through Dealey Plaza<span> in </span>downtown Dallas<span>, Texas.
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One group can be African Americans. Racist states found ways to prevent them from voting by imposing things like laws that force you to take a literacy test or similar. They also forbade them from working like regular workers by introducing the cropsharing system.
Another can be women. Women had been fighting for their political rights since before the war began. After it ended, they were still not given voting rights which lasted up until 1920s. Many women objected how African-Americans could be given voting rights and women
Third group can be Native Americans. After the war ended, the country could then start spreading westwards which had to be halted due to the war. More states began being added and this meant that Natives would have to move to reservations and their rights and land were being taken from them.
Answer: 1) one state party that monopolizes all the power (there is no pluralism within society), 2) strong indoctrination in all parts of society and organized by the ministry of information/culture/propaganda (and its apparatus), 3) cenzorship, 4) repressive apparatus, 5) society is "closed" (meaning of "closed society": Karl R. Popper), 6) there must be some official myth turned both to the past and future
Explanation: my answer has to do with the political practice and not with the theory. In fact there were no Communist societies/regimes in this world. There were just 1) Communist philosophies, 2) Communist parties, 3) official Communist propaganda. In spite of all that there are still Communist parties and Communists. Perhaps there are even Marxist historians. Communism has to do with a belief we humans usually have (also thanks to Enlightenment): that each idea can be put into practice. Communist experiment can be viewed as a useful but not successful attempt to put Communist ideas into practice.