the UK Variant has at least 2 cases now, one in Colorado and one in San Diego:

which likely means that the UK Variant is already endemic to the U.S. at this point because neither case is in someone who has been traveling. So, this means that they got it likely from the person who is traveling OR they got it from someone who maybe knew or contacted the person who was traveling from UK or other European countries.

So, because of this the UK variant is likely endemic to the U.S. all over right now.