The US can and does set quality standards for products sold on its markets. This doesn’t improve the quality of the cars sold in the US, it just makes them more expensive. It may even have the indirect effect of reducing the quality of vehicles sold in the US because increasing price instead of setting and enforcing quality and testing standards means lowering quality to maintain or increase profits is still an option.
The US can and does set quality standards for products sold on its markets. This doesn’t improve the quality of the cars sold in the US, it just makes them more expensive. It may even have the indirect effect of reducing the quality of vehicles sold in the US because increasing price instead of setting and enforcing quality and testing standards means lowering quality to maintain or increase profits is still an option.