It soon saw a revival as black people began tying their struggle to that of ending slavery. In Atlanta, some campaigners for equality wore Juneteenth buttons. During the 1968 Poor People's Campaign to Washington, DC, called by Rev. Ralph Abernathy, the Southern Christian Leadership Conference made June 19 the "Solidarity Day of the Poor People’s Campaign".
On June 28, 1968, Congress passed the Uniform Monday Holiday Act, which moved four holidays, including Memorial Day, from their traditional dates to a specified Monday in order to create a convenient three-day weekend. The change moved Memorial Day from its traditional May 30 date to the last Monday in May. The law took effect at the federal level in 1971. After some initial confusion and unwillingness to comply, all 50 states adopted Congress's change of date within a few years.