In real life you dominate everywhere or nowhere, if the American goverment doesn't wants their companies to make money in China that is their problem but that doesn't mean Chinese are not going to try to make money from the US market. Chinese companies can't buy the best Lam etching tools but US companies still can buy etching tools from AMEC. So more money and market share to AMEC.Why are they creating a US subsidary?
The remembers me of DJI, in 2012-2014 there was a drone company making drones in the US called 3DR, they got their drones included in the ITAR list. While DJI were able to sell their drones globally including in the US, 3DR were able to sell to only a handful of countries, guess who is the dominant player in the US after that.