On May 17, 2004, Massachusetts became the first state in the United States to issue same-sex marriage licenses. Prior to this landmark decision, all same-sex couples in the country were denied the right to officially marry and access the associated benefits, such as tax advantages, legal protections, property rights, and personal benefits. This historic day marked a significant step forward for the equality and dignity of the LGBTQ+ community.

The decision to issue same-sex marriage licenses in Massachusetts stemmed from a legal case known as Goodridge v. Department of Public Health. In 2001, seven same-sex couples applied for marriage licenses but were denied. The couples argued that this denial was a violation of the Massachusetts Constitution. On November 18, 2003, a landmark ruling was made when the courts determined that same-sex couples could no longer be legally excluded from marriage. As a result, Massachusetts became the first U.S. state to legalize same-sex marriage, and the sixth jurisdiction in the world to do so, following the Netherlands, Belgium, Ontario, British Columbia, and Quebec.

In 2008, Connecticut became the second state to legalize same-sex marriage, following Iowa in 2009. Both states achieved this milestone through legal proceedings. In the years that followed, Maine, Maryland, and Washington also legalized same-sex marriage, but they did so via voter initiatives on their ballots. Ultimately, in 2015, the Supreme Court case Obergefell v. Hodges legalized same-sex marriage at the federal level, making it legal nationwide. Today, all individuals in the United States, regardless of their sex or gender, have the right to marry legally and enjoy all associated benefits.