I don't know if true or not that foreign nationals driving for trucking companies is increased, or so I hear the complaints, but I do know some of our biggest wrecks in recent history started from one of these people making some very poor decisions driving a 60000 lb rig. We had a multi car pileup a couple years ago in the winter on I-80 east a little ways of where this was from a Mexican driver who just stopped his rig in the middle to highway in poor visibility.
Driving skill isn't the only thing since covid that declined with people in general.
It's not even them, the mentality is a lost cause among the current and younger generations as trucking requires patience and thinking ahead, not instant glorification and tailgating. These folks simply aren't driving a car where the vehicle can react fast, preparing for the inevitable (thanks to idiot drivers) must be done before they screw up (and they will, many times over during even a short day) before someone is hurt, killed, or property is damaged. The naivety, lack of a proper mind set, and their constant need for instant gratification (constant distraction) don't make them good candidates for new drivers.
By law you need to be a citizen or a permanent resident to even obtain a CDL. Naturally some less than other folks lie or run CDL mills where they offer fake licenses. It's sad, but the politician's policies made a criminal enterprise that caters to those that shouldn't be here legally. This problem has been ongoing for decades, not just after covid sadly. Both parties have been kicking the can down the road and we're just now getting around to cleaning the mess up.