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On April 20, 1971, the Supreme Court ruled unanimously in Swann v. Charlotte-Mecklenburg Board of Education that busing of school students could be ordered to achieve racial desegregation.

On April 20, 1946, the League of Nations was officially dissolved with the close of its final session. Thirty-four countries had attended the final meeting at which they elected to dismantle the organization and bequeath its assets to the United Nations.

Read a history of League of Nations from the UN.