People in the south used slaves because their economy was focussed on things like cash crops (tobacco, cotton, etc.) These crops required a lot of work so farmers and plantation owners could not do it by themselves. So by using enslave persons they could harvest more crops, sell more, make more money, and in return boost the southern economy.
The earlyest form was monarchy.
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To outline the reasons behind the writing of the US Constitution and the goals of the document.
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Jews were encouraged to leave the country, they forced Jews out of schools and professions like medicine and teaching, they banned Jew/Non-Jew relationships, segregation, forced them to wear the Star of David. The Nazis started off small, but eventually took away huge rights for them.