What was “radical” about “Radical Reconstruction”

What was “radical” about “Radical Reconstruction” - What was the outcome of the 1896 Plessy v. Ferguson Supreme Court ruling? - What is meant by the concept of "twoness," as defined by W.E.B. DuBois? - What did Marcus Garvey hope to achieve through his UNIA? - What was meant by the Great Migration after World War I? - What was the Harlem Renaissance? - What are meant by Legal, Grass Roots, and Direct Action Activism? - What was important about the Brown v. Board of Education Supreme Court ruling? - Please understand the significance of civil rights events from 1955-1965, including Rosa Parks, Sit-ins, the Freedom Riders, and the Selma Bloody Sunday March. - What was meant by the American Dilemma in 1944?