Why is the EU such a failure economically? Because the EU opened up their borders and allowed open immigration of people who are historically not highly productive.
The same trend is being attempted in the US with the open border, non enforcement of the laws. Bringing in people who are uneducated and have not routinely had access to good preventive medical care is driving up the cost of social welfare programs. At the same time, they are bringing down the average wage of American Citizens who are having to dig deeper with taxes to pay for the social welfare state. If allowed to continue, our productivity will decline comparable to that of the EU.
This is not a conspiracy. This is a fact. There is nothing that can convince me that abandoning our sovergnity as a nation is a good move. This whole North American Union is a disaster waiting to happen. There is nothing silly about a disaster in the making.
Actually, the EU's GDP is a tiny bit bigger than the United States.