June is Lesbian, Gay, Bisexual and Transgender Pride Month (LGBT Pride Month)?
June was chosen to honour the 1969 Stonewall riots in Manhattan.
The Stonewall riots were the tipping point for the Gay Liberation in the United States.
According to the U.S. Census Bureau:
In 1990, if [an individual] reported as a same-sex married couple, the sex of one individual was edited to reflect opposite sex arrangement.
In 2000, if reported as a same-sex married couple, the relationship of the couple was edited to reflect a same-sex unmarried partnership