During the 1960s, black activist Martin Luther King, Jr. would call Sunday morning, when most Americans go to church, "the most segregated hour in America." The seeds of that segregation were sown at the end of the Civil War, as four million freedpeople fled the white churches where they had been forced to worship as second-class citizens, and formed their own denominations. Competition among Methodist, Episcopal, Baptist, AME, and Presbyterian sects was furious as missionaries flowed from the North to the South in what religious historians refer to as "Religious Reconstruction."