(CNN)Here's some background information about same-sex marriage in the United States and worldwide. On June 26, 2015 the Supreme Court rules that states cannot ban same-sex marriage.
* Status of state legislation prior to the June 26, 2015 Supreme Court ruling that states cannot ban same-sex marriage:
In the following 37 states and the District of Columbia: Alabama, Alaska, Arizona, California, Colorado, Connecticut, Delaware, Florida, Hawaii, Idaho, Illinois, Indiana, Iowa, Kansas, Maine, Maryland, Massachusetts, Minnesota, Montana, Nevada, New Hampshire, New Jersey, New Mexico, New York, North Carolina, Oklahoma, Oregon, Pennsylvania, Rhode Island, South Carolina, Utah, Vermont, Virginia, Washington, West Virginia, Wisconsin and Wyoming.
Georgia, Kentucky, Michigan, Mississippi, North Dakota, Ohio and Tennessee.
(Courts in the following states have declared same-sex marriage bans unconstitutional, but the rulings have been stayed) Arkansas, Louisiana, Missouri, Nebraska, South Dakota and Texas.
Twenty other countries (and parts of Mexico) also have laws allowing same-sex marriage. Most of these are in Europe and South America.
Civil unions grant couples most of the rights of state civil marriages, but provide none of the federal benefits of marriage, such as Social Security benefits.