Post WWII, there was a push to return to tradition values. The US Military had banned gay people and in 1953 President Eisenhower signed an executive order which ruled that being gay was grounds for being fired from government jobs. In the 50s, LGBT+ people had not yet mobilized a successful political movement. In the 60s, the Gay Liberation movement began to form.
Information courtesy of International Socialist Review.

The Stonewall Inn was bought by the Mafia and was turned into a gay bar. The bar operated as a "bottle bar," which meant that it was a private club in which patrons were supposed to bring in their own liquor, however the bar illegally sold alcohol. The mafia bribed the NYPD in order to maintain their illegal operation. Stonewall was a safe haven for LGBT+ people who would be denied service or persecuted elsewhere.
Information courtesy of amnewyork.

On June 27th, police dressed in plain clothes invaded The Stonewall Inn. On the early morning of June 28th, the police frisked and publically arrested several LGBT+ people on dubious charges. At this point, many LGBT+ people who had gathered there began to riot. The riots lasted 6 days and stretched across several streets in NYC. The Stonewall Riots are credited with starting the LGBT+ rights movement in the US.

The Christopher Street Liberation Day March took place, marking the first ever LGBT+ pride march. The march marked the first anniversary of Stonewall and took place in New York. There were sister marches held in Los Angeles, San Francisco, and Chicago. The Christopher Street Liberation Day March has now evolved into the marches across the United States known as "Pride."
Information courtesy of The History Channel.

President Obama established the Stonewall Inn as a national monument, signifying its cultural significance towards the gay and human rights movements. The Stonewall Inn's status as a national monument is both a signal of the remarkable social change which took place over the 37 years since Stonewall and a sign that LGBT+ people can find safe and comfortable lives in the Unites States.
Information courtesy of amnewyork.

Pride marches occur every June across the country to celebrate and commemorate The Stonewall Riots. June 28th, 2019 will mark 50 years since The Stonewall Riots. Pride is a way to remember Stonewall and all the queer activists and allies which made LGBT+ rights possible and the work still yet to come.