The bigger issue is that isn’t just one government. And those governments largely do not allow free trade, especially historically. Only recently was a limited

The bigger issue is that isn’t just one government. And those governments largely do not allow free trade, especially historically. Only recently was a limited free trade agreement finally signed between provinces. In the US, the federal government supersedes the individual states. It can come down heavy handed and say that trade between states is there to go nuts with. In Canada, the federal government is only an equal to the provinces and must stay in its lane. Matters like interprovincial trade is beyond its jurisdiction.