36 states same-sex marriage “gay marriage steamroller” http://www.bbc.com/news/world-us-canada-21943292 federal legalization United States How legal tide turned on same-sex marriage in the US legalization How legal tide turned on same-sex marriage in the US How legal tide turned on same-sex marriage in the US same-sex marriage same-sex marriage legalization How legal tide turned on same-sex marriage in the US