Ten years have passed since my book, “The New Jim Crow,” was published. I wrote it to challenge our nation to reckon with the recurring cycles of racial reform, retrenchment and rebirth of caste-like systems that have defined our racial history since slavery. It has been an astonishing decade. Everything and nothing has changed.

When I was researching and writing the book, Barack Obama had not yet been elected president of the United States. I was in disbelief that our country would actually elect a black man to be the leader of the so-called free world. As the election approached, I felt an odd sense of hope and dread. I hoped against all reason that we would actually do it. But I also knew that, if we did, there would be a price to pay.

Everything I knew through experience and study told me that we as a nation did not fully understand the nature of the moment we were in. We had recently birthed another caste system — a system of mass incarceration — that locked millions of poor people and people of color in literal and virtual cages.

Our nation’s prison and jail population had quintupled in 30 years, leaving us with the highest incarceration rate in the world. A third of black men had felony records — due in large part to a racially biased, brutal drug war — and were relegated to a permanent second-class status. Tens of millions of people in the United States had been stripped of basic civil and human rights, including the right to vote, the right to serve on juries and the right to be free of legal discrimination in employment, housing, education and basic public benefits.