Original sentence: Civil unions are a separate form of legal union open to couples of the same sex, often carrying the same entailments as heterosexual marriage under a different name
Edited sentence: Civil unions are a separate form of legal union open to couples of the same sex, often carrying the same entailments as heterosexual marriage under a different name (except in the United States).states, where they provide only the State marital benefits (about 100 benefits)and not the Federal marital benefits (over 1000 benefits)