In most of Brazil, Afroamerican religion is Candomblé, which is rooted in Yoruba traditional religion, with influences of Angola-Congo traditions. The main exception is the Northeastern state of Maranhão, were Daomeyan (Ewe) tradition (Vodum) dominates.
Now, Maranhão was settled by the French, before being conquered by the Portuguese (São Luís is, as it is said, "the only Brazilian capital city that wasn't founded by the Portuguese").
And if I look for other places where Vodum predominated over Candomblé, I find Haiti (Voudu) and Louisiana (Voodoo). In the rest of the Americas, either Afroamerican religions were completely eradicated, or they are predominantly influenced by Yoruba tradition (except, I think, for Guyana, where Fanti-Ashanti tradition is the main influence).
But both Louisiana and Haiti were French colonies, like Maranhão originally was. So my questions are, is this merely a coincidence, or is it somehow related? Would it have to do with different European metropoles controlling different regions in coastal West Africa, or different slave trade routes? Are there studies, books, papers, that deal with this issue? Or have the sources that could shed some light upon this destroyed, leaving the question unanswerable?