The final hour brings the story up to the present day. As the 21st Century dawned, the tragedy of Hurricane Katrina came as a wake-up call, revealing that the black poor were still grappling with issues that the civil rights movement set out to resolve decades earlier. After this sobering revelation, Senator Barack Obama's announcement that he would run for President sparked a wave of hope that the country might at last be ready for real change. Voters of all races carried Obama to victory in 2008, setting off excited speculation that America had finally become a "post-racial" nation - even if nobody was quite sure what that meant. Former Attorney General Eric Holder gives Gates an inside view on the challenges of the Obama Presidency. While the symbolic importance of a black family in the White House was enormous, once Obama took office, he had to confront two foreign wars and a massive financial crisis -along with partisan attempts to block his political agenda that took on a distinctly racial tone. Moreover, as Gates carefully shows, America's old problems did not disappear with the election of a black president. At a Boston public school, teacher Marcus Walker shows Gates the new face of racial and economic segregation. Ronald Day, who became a criminal justice advocate after prison, returns to illuminate the harsh reality of mass incarceration: a staggering number of black men still behind bars, and daunting challenges awaiting them on the outside. As incidents of lethal police brutality continued to occur, a new movement began taking shape, with young activists like DeRay Mckesson and Alicia Garza and high-profile entertainers and artists like Beyoncé and Kendrick Lamar rallying around a starkly simple new slogan: Black Lives Matter. The series ends where it began: on the Edmond Pettus Bridge in Selma, with Gates raising questions about the past and future of black America: Why does racial equality still elude us? What would it take to realize the goals of the civil rights movement? And what lies ahead in the years to come? Just one thing is certain: with the determination and strength wrought by years of struggle, African Americans will find a way forward.