They can do but they have to bear a lot of cost for doing that.
Bitcoin mining requires a lot of energy. So anyone who wants to set up a mining farm will try to set it up in a place where electricity price is relatively cheap and mining equipment is available at low prices. That's why most the miners prefer places like China, Cyprus where electricity prices are relatively low.
Isn't US energy prices cheap too? AFAIK some states have cheap electricity, don't they have nuclear power plants in the US? Besides the power costs, I think that the reason that there are little to no companies specializing in bitcoin miners is the lack of investors unlike other countries that are the main investors in the project US has problems making it past these potential investors.