What important fact do the stories of Black cowboys, such as Nat Love and Isom Dart, illustrate?
Most Black cowboys were never enslaved and were recruited by ranch owners because of their strong work ethic.
All Black cowboys were once enslaved but made positvie contributions to ranching and the cattle industry once they were freed after the Civil War.
Black cowboys used many skills they learned while enslaved to earn a living as cowboys after the Civil War.
Vaqueros and Black cowboys rarely worked together due to competition for the same jobs, so there is no similarity between their contributions to ranching.