50 years ago today Rev. Martin Luther King Jr. gave his famous “I have a dream…” speech on the steps of the Lincoln Memorial. More than 250.000 people had assembled on the National Mall for the historic “March on Washington,” which Rev. King called “the greatest demonstration of freedom in the USA.” The Civil Rights movement put an end to segregation and the breakdown of racial barriers. Today, African-Americans constitute the largest minority group in the US Congress and the election of Barack Obama as first African-American President in 2009 was taken as a sign that the United States had overcome its racist past.