As he gave his second inauguration speech on Jan. 21, President Obama mentioned the Stonewall Riots and called for marriage equality, marking the first time a president mentioned "gay" in an inaugural speech. (Read the full text of his speech).
"We, the people, declare today that the most evident of truths - that all of us are created equal - is the star that guides us still, just as it guided our forebears through Seneca Falls and Selma and Stonewall," Obama said.
Each of these were catalysts in their respective efforts for equality.
Women's rights activists met in Seneca Falls, N.Y., in 1848, producing the Declaration of Sentiments, which called for the right to vote. The Seneca Falls Convention, attended by Elizabeth Cady Stanton and Lucreita Mott, was the first major women's rights event in the United States.
Selma was the location of several civil-rights marches in 1965 in protest of Alabama's efforts to block African-American voting, which included police attacks and the deaths of two protesters.
Later in his speech, Obama again reiterated his support for marriage equality.
"Our journey is not complete until our gay brothers and sisters are treated like anyone else under the law," he said. "For if we are truly created equal, then surely the love we commit to one another must be equal, as well."
Obama publicly voiced his support for same-sex marriage last May.
Watch the full speech here: