Hi
I don't think your US Buers are anything to do with my English Buers. We have no record of any US link (although there could be, but we have just not found it).
Buer is a German name and quite common there so it is more likely your family is from that source. My English Buers, we can trace back to at least 1706 and probably earlier, so the family has been English for many generations.
Regards
Max