The United States has always been hostile to outsiders—what’s different now is that they’re not even trying to hide it.
As a naturalized Canadian, crossing the U.S. border has always been a frustrating ordeal. Despite holding a valid Canadian passport, I’m routinely subjected to an extra hour of “security” questioning. Maybe I’m just unlucky. Or maybe it’s because I was born in an "undesirable" Middle Eastern country and have brown skin. One time I was detained for 5 hours and were questioned about "Islam" (ironically, I'm a Christian so I couldn't answer their questions).
My belongings are always searched, and I’m treated as less than human by CBP. I suspect that if you’re white, crossing from EU or elsewhere, you were used to an easier time until now.
The gloves are off.