It's not a case of being "stuck" per se. It's just not cost effective to move production on this kind of stuff overseas. Shipping goes by volume, and cars have an absolutely atrocious cost to volume ratio (think about how many dollars worth of iPhones you could stuff into the space occupied by a single car). It makes a lot more sense to build them where you plan to sell them (broadly speaking). That's why a lot of car manufacturing still happens in countries like the US, Canada, and the UK.