Questions about the tariffs levied by a government, sovereign authority, or local authority on the importation and/or exportation of merchandise into or out of the dominions of the authority.

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When was the last time there were border controls, customs, or border patrols inside what is now the contiguous US?

Reading about the complexities of Europe has made me wonder about when American (internal) borders were less porous. Also, were the borders between the 13 colonies completely open? Or did they at ...