You're right. What does imply the other is the disproportionate percentage of African-Americans in the prison popuplation, relative to the percentage they are of the overall population (see https://en.wikipedia.org/wiki/Incarceration_in_the_United_St...). African-Americans are disproportionately imprisoned in every state; in twenty states, they're imprisoned at five times the rate you would expect by their share of the state's population.