Migration refers to movement, not merely natural migrations, but forced ones. The Duty and Tax refer to an imported good; specifically the slave. The importation (bringing property into America) and migration (moving the livestock...aka slaves into different states to be sold) of slaves can only apply to slaves, and not the immigration of free people.
The Constitution says that the federal government may not have implied powers or the power to restrict or legislate immigration.
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"I'm completely in favor of the separation of Church and State. My idea is that these two institutions screw us up enough on their own, so both of them together is certain death."
- George Carlin
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