The Chinese trade war was going on for a while now. In addition it seems that issues regarding china are one of the things that both parties seem to agree on. Although you are right that there wasn't such an issue with Europe and Mexico before the current administration.
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You can be at war, as a pacifist, in total denial of reality. That's what the USA did with China. The trade war was really active, but the USA was just taking damage without any response. The non-response was pretty dumb.