Yeah, for sure there would and had always been no problem for US nationals to drive into Mexico and return to the US. The huge issue is that fully vaccinated Canadian and Mexican nationals are, um, locked in their respective countries and cannot enter the US by road.
For me to pick up mail just across the border in the US from our home in canada 15 minutes drive from the US, I would have to either rent a private aircraft and fly to a regional US airport 15 minutes drive from us (!). Or, drive 200 kilometers to Montreal, jump on a flight to Burlington VT or, God forbid Boston, rent a car, and drive 6 hours or 2 hours to my agency on the border!also, we can't visit our relatives 30 minutes drive from us in the US, without spending a day or two and several thousand dollars putzing around with the same logistical nightmare outlined above. Same for Mexican nationals fully vaccinated!
Canada allows US citizens to drive into Canada 2, 3, 4 times a day at will for any reason. As long as they are vaxed and have had a Covid test. According to my neighbor a US / Canadian citizen, gets a Covid test on the US side at no cost.
See what I am saying?
