It's how consumerism has grown in the US. Look at the price of fast food in the US and in Europe, as well as what you get for that price. While prices in the US are lower than in the Netherlands, the portions are bigger. If you sell more for less of course you have to cut down on other costs when wanting at least the same profits. And then wages are the easiest target, considering the location and the building maintenance can't easily be made cheaper.
If you want lots of cheap labor you have to provide cheap living (which people don't want nearby as they don't want to have to look at it usually) and cheap transport to/from work, as well as a hospital and police and such for those cheap cities. Which basically means you'd need to get decent and fast transport from Detroit to the rest of the country