Freedom to Marry was launched in 2003 by Evan Wolfson, the civil rights attorney generally considered the architect of the national marriage equality movement.

On June 26, 2015, the Supreme Court ruled in favor of the freedom to marry nationwide. This is the story of a movement that transformed a nation, and the campaign that led to victory: Freedom to Marry.

On June 26, 2015, the U.S. Supreme Court ruled 5–4 in Obergefell v. Hodges that states cannot prohibit the issuing of marriage licenses to same-sex couples, or to deny recognition of lawfully performed out-of-state marriage licenses to same-sex couples. This ruling invalidated same-sex marriage bans in any U.S. State and certain territories.

Officially founded in 2001, Marriage Equality USA is a volunteer-driven national grassroots organization whose mission is: "to secure legally recognized civil marriage equality for all, at the federal and state level, without regard to gender identity or sexual orientation"

The National Center for Lesbian Rights works for fair and legal recognition of same sex relationships and marriage. The site provides reports and research on laws within the United States as well as documents on ways the LGBTQ community can protect their families.

The National Gay and Lesbian Task Force publishes reports and research on a variety of topics related to the LGBTQ community including information related to anti-gay industry, campus issues, faith, hate crimes, marriage, parenting/family, transgender issues, and youth.