Americans across the country are observing the birthday of civil rights leader Martin Luther King, Jr. who was assassinated in 1968.
U.S. Observes Martin Luther King, Jr. Day
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Marchers line up and lock arms before they make their way to the Edmund Pettus Bridge in honor of Martin Luther King Jr., Selma, Alabama, Jan. 18, 2015.
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Homeland Security Secretary Jeh Johnson (left) participates in a wreath laying ceremony at the Martin Luther King, Jr. Memorial, on MLK Day, in Washington, Jan. 19, 2015.
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Homeland Security Secretary Jeh Johnson, left, participates in a wreath laying ceremony at the Martin Luther King, Jr. Memorial, on MLK Day, Monday, Jan. 19, 2015, in Washington. Also attending were DC Mayor Muriel Bowser, center, with Harry Johnson, Pre