Humans have always disliked the unlike, or fear of the unknown. In ancient times the several Israeli tribes feared the outsiders. Later Greeks were feared because they believed in polytheism, while Jews and Christians believed in monotheism, so there ideas clashed. They had a fear of the unknown. During World War II, Jews were put in concentration camps because they were viewed as different. The Nazi's disliked the unlike. Even today we fear the unknown. Today, we partly fear the middle east because their ideas and way of doing things are different from ours.
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