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Mar 6, 1857: The Supreme Court ruled in Dred Scott v. Sandford that slaves were not citizens.

Mar 6, 1930: Clarence Birdseye started to sell prepackaged frozen food for the first time, in Springfield, Massachusetts.

Mar 6, 1981: Walter Cronkite, “the most trusted man in America,” retired from the CBS Evening News and was replaced by Dan Rather.

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