Also all the menus will be in japanese too.

Actually, he is correct. The Ma Bell breakup in the 80s is a good example of this. The newer, smaller companies grew much faster than the original.

That would be ridiculously difficult to enforce. Also, most manufacturing, American or not, is already done in metric. It would be trivial for companies to swap units. There are many, many better ways to tariff American goods.

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