Maybe subsidy is the wrong word but we do put an extra $170 billion into the Mexican economy that they use for things other than buying goods from us and that is a sizable chunk of their total GDP.
Come back when you realize how absolutely precious Mexico is to the US economy. Oh, fuck it, I'll bite.
The supply chain in the US is heavily dependent on products from China that are much cheaper than those produced in the US, not only because of cheaper labor, but are the result of currency manipulation as well. China is literally footing the bill for these product for US consumers and accumulating a vast amount of debt as a result. For better or worse, that party is starting to end. Given that the Chinese debt crisis is roughly an order of magnitude greater than what the US saw in 2008, they're headed for trouble. That doesn't even begin to mention that the cheap labor in China is also drying up. It's been the case for quite some time that labor in China is less skilled and more expensive than other areas. Their manufacturing base and subsidies are the only reason they are still able to export as much as they do.
That doesn't even begin to mention their imploding demographic. The population numbers in China have been falsified for years. The one child policy and urbanization have gutted the birth rate. There are now more people in China older than 50 than under 50. Young people are the consumers and there aren't enough of them to keep the country afloat amidst the mounting debt.
The US quite literally cannot build a manufacturing base quickly enough to replace what we're about to lose. If you think you've seen bad inflation recently then hold on to your socks because you ain't seen nothing yet.
In comes Mexico that has a growing, young, and skilled workforce and the capacity to produce good and services at a cost folks in the US are willing to bear. If we fuck up that relationship, then those of you that are living on the margins are going to suffer. That is, the walmart shoppers among you that won't spend a cent more than you have to. Suddenly, those few cents you have won't yield the same quality of life you've been accustomed to.