If protectionism is so good then all 50 states should adopt protectionist measures against each other.
The Constitution doesn’t allow that, and for good reason.
If free trade is so good everyone on your block should remove the front doors of their houses. The most skilled man should do all the work for all the houses on the Block the hottest wife should put out all the sex the best cook should cook for all the families.... how selfish to insist on one economic family unit being relatively independent
The point is free trade is good between the 50 states.