I understand that it is usually possible to have a civil union registered in one country recognized abroad (e.g., in the UK, thanks to the Civil Partnership Act), but please correct me if I got the wrong impression.
However, last month, the third civil union of three people was registered in Brazil. Are there any countries in the Western world where such a union would be recognized? Are there any countries where such a civil union would fall under bigamy laws?
(I am unsure if I picked the correct tags, so please help me fix that if you have any better ideas!)