And that’s why it’s in the Constitution.
The United States are a free trade zone by design.
Every damn principality in Europe had a customs office on every road in and out of their rotten little fiefdoms. It was said you could not sail down the Rhine without getting dunned every few miles. It was shakedown town.
It leads to restraint of trade and freedom of movement. That’s why it was Constitutionally prohibited.
European practices weren’t the reason.
Under the Articles of Confederation, trade was horribly affected by a variety of imposts, fees, tariffs, etc. on commerce among the states.