Final answer:
The first U.S. National Bisexual Conference was organized by BiPOL in 1990 in San Francisco.
Step-by-step explanation:
The first U.S. National Bisexual Conference was organized by BiPOL in 1990 in San Francisco. This event marked a significant moment in the history of bisexual rights and activism within the United States. Following this inaugural conference, the second national conference was linked with the 1993 March on Washington for Lesbian, Gay and Bi Equal Rights and Liberation, which was the first national march to explicitly include bisexuals in its title.