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In working out USA constitution,the North and the South has reached three compromises on the problem of slave.Actually it can be divided into two parts with the three compromises summing up together.The first is to give the South 20-year buffer on the problem of forbidding import slave.The second is that the federation admits having no rights to make mandatory sanctions on every state in related on the matter of how and when the slavery remained from colonial period would be solved.

In working out USA constitution, problem about slave has mounted , reached north and south both sides three to compromise. Induction this three compromising get up , can divide into two parts in fact. A part is buffer scheduled time having given the south 20 on slave's problem in import embargo . Second parts be, how as well as when the problem resolving the slavery colonizing a period leaving over is upper , federation admits that having no right to make mandatory to every prefecture cutting.<