What part of that section says that the US government may prevent citizens from engaging in trade?
Are you saying that if the local Piggly-Wiggly decides to not sell groceries to a robber, they are engaging in aggression against the robber?
Are you saying that Piggly Wiggly is an arm of the federal government?
Sigh. Posted for your edification:
The Congress shall have power to lay and collect taxes, duties, imposts and excises, to pay the debts and provide for the common defense and general welfare of the United States; but all duties, imposts and excises shall be uniform throughout the United States;
To borrow money on the credit of the United States;
To regulate commerce with foreign nations
Demidog, you're a hoot. You act as if you're dumb as post, but you're a hoot.