Is the stock market open on Martin Luther King Jr. Day? Will the post office deliver mail?

On Monday, Americans will pay tribute to the late civil-rights leader Martin Luther King Jr.

Martin Luther King Jr. Day commemorates the life and legacy of King, who was born on Jan. 15, 1929, and became a leading voice in the fight for racial justice. MLK Day, as the holiday is often called, was made a federal holiday in 1983 and was first observed in 1986.

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