Roller derby has existed since 1935, but the flat-track version most fans know today only took shape in the early 2000s. In the two decades since, no team has done what Black Derby Collective just did: become the first sanctioned all-Black team in the Women's Flat Track Derby Association's history — and qualify for the biggest stage the sport has, in their very first season. WATCH: The full conversation with Blaque Jac, Erin Jackson, and Blaxyl Rose on the Black Rosie Media Y