If you've taken an autosomal DNA test with Family Tree DNA you might want to check out a segment on chromosome 2, It starts at about 134334310 going to about 137632795 and containing 2.6 cM or 798 SNPs.
According to an article Minimum Inherited DNA Segment Size and the Introduction of Familial Autosomal Haplotypes, by Michael R. Maglio, this segment correlates to a Western Atlantic ethnicity. He terms it the Western Atlantic Autosomal Haplotype.
Although my matches are at the same location on chromosome 2 there's no way of knowing if the SNPs are the same as Maglio found.
Many people are skeptical about autosomal matches on small segments. I'm cautious. The article by Maglio isn't peer reviewed.
It would be interesting to know if others have multiple matches at the location of this small segment.