As a whole, the United States of America, the Land of the Free, incarcerates more citizens than the rest of the world (CNN). Of those incarcerated, black citizens are more likely to be arrested and serve longer sentences than white citizens for the same crime.
Wikipedia
The New Jim Crow
Race in the United States criminal justice system
Incarceration in the United States : Ethnicity
Video
Mass Incarceration: The Crime of Being Black in America (Frank & Marshall College)
Mass Incarceration, Visualized (The Atlantic)
The Enduring Myth of Black Criminality (The Atlantic)
The human stories behind mass incarceration (TEDWomen – Eve Abrams)
The New Jim Crow: Mass Incarceration and Institutional Racism (Unitarian Universalist Association)
Further Reading
Minnesota exposes one troubling reason America locks up so many black people (Business Insider)
Mass Incarceration (ACLU)
Mass Incarceration: An Animated Series (ACLU)
Slavery to Mass Incarceration (Equal Justice Initiative)
The Black Family in the Age of Mass Incarceration (The Atlantic)
Mass incarceration of African Americans affects the racial achievement gap — report (Washington Post)
The Social and Moral Cost of Mass Incarceration in African American Communities (University of Pennsylvania Law School)