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Timeline of gay marriage in US

Gary McDowell, left, and Zachary Marcus, both of Providence, R.I., displayed their newly obtained marriage certificate at City Hall in Providence.

Steven Senne/AP

Gary McDowell, left, and Zachary Marcus, both of Providence, R.I., displayed their newly obtained marriage certificate at City Hall in Providence.

In the early 1970s, there were zero states banning or allowing same-sex marriage, and no states offered civil unions or domestic partnerships. Today, 13 states perform gay marriages, seven states allow civil unions or domestic partnerships, and 30 states have consitutional amendments referencing bans on gay marriage. Here’s how it happened.

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