*That* is a tough question. There is no simple "country of origin" any more. Vehicles from all manufacturers are built from parts sourced all over the world, and the same suppliers supply many different brands. (A company that specializes in building oil pumps, builds oil pumps for everything. A company that specializes in building door latches, builds latches for everything. A company that specializes in making windows, makes windows for everything. And so on.)
So what it means is that it's largely unfair to discriminate against any particular brand because of who the manufacturer is or where the final assembly plant is. It also means that some brands are coasting on prior reputation that might not necessarily still be deserved.
People make a fuss over the JD Power IQS ratings. The difference between the best 10% and worst 10% is between an average of approximately one "thing gone wrong" per vehicle and approximately two "things gone wrong" per vehicle. Big. Freaking. Deal. And a "thing gone wrong" nowadays is frequently "The infotainment won't pair with my phone" or some such thing, as opposed to "The engine grenaded".
Historically I've owned vehicles that keyboard warriors love to hate. Historically VW (and I put >400,000 km on two of them), currently FiatChrysler. And I will grant that the Fiat has had its two things go wrong (in a year and 40,000 km, as opposed to the first three months of the IQS). Someone at the assembly plant forgot to tighten a bolt in the left power window regulator; it fell out a week after I took delivery. And ... a week ago, the outside air temperature sensor or circuit started acting up intermittently (this morning the instrument cluster was displaying -6 C outside temperature for a couple minutes until it sorted itself out). The nuisance is that this shuts the A/C down because the automatic climate control thinks it's below freezing outside, so there is no need to run the A/C. I know from the internet forums what's wrong ... the plug for the sensor (which is in the right-side outside mirror) needs to be unplugged, cleaned, and plugged back in again. For the moment, I'm fixing this by driving with the top down (cabrio) ...