Simply put, Huawei's products have better quality and companies in the US can't compete with it.
They are already #1 in telecommunication equipment and for consumer electronics like smart phones, they are killing other competitors in markets like China and Europe. Their phones were just like another cheap knock-off a few year back and what impressed me most is how they innovated through hard core R&D in the last 3 years.
I'm now typing on a Huawei Matebook 13 and carrying a Huawei Mate 10 phone. Those things have amazing quality and it's a real pity customers can't have them in the States.