Even though a black family lives in the White House, hardly anyone seriously argues that we live in a postracial society. That aspirational description of 21st century America came into vogue about four years ago, as President Barack Obama raced to victory in the 2008 presidential election, and a great number of black and white Americans wanted to believe the nation was finally closing the books on its discriminatory history.

But no. President Obama’s election didn’t suddenly sweep away all the accumulated consequences of past racism in our society. The preexisting racial disparities, so engrained in the fabric of our economy and culture, didn’t erase themselves in the wake of his victory.