I really don't even pay attention to where bands are from a lot of the time, especially if they happen to be from the US. I couldn't care less where a band is from unless it is actually relevant to the music itself.
That said, US Black Metal bands that I do like: Profanatica (Totem/Contrivisti/Havehej), Tearstained, Night Conquers Day, Into The Sunless Meridian, Grand Belial's Key, Demoncy, Ceremony, I Shalt Become, Weakling, Xasthur (Nocturnal Poisoning), Leviathan (occasionally), Wolves In The Throne Room, Fanisk, Eldrig, Absu, Averse Sefira, Black Goat, Inquisition, Krieg, and possibly a few others I can't recall.