[["Television executive and American entrepreneur, Robert Louis Johnson became the first African-American billionaire in 2001, when he sold his cable television network BET for $3 billion to Viacom.", 185.0], ["Robert L. Johnson became the first African-American billionaire in 2001 after selling the network Black Entertainment Television to Viacom.", 76.0], ["Robert L. Johnson, co-founder of BET", 33.0]]
who is the first african-american billionaire in the united states
history