Find out why Martin Van Buren is known as the "ok" president, and why he's considered the first professional politician to hold the office.

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Find out why New York Democrat and American President Martin Van Buren was considered the ultimate political machine in American politics.

On the night of January 27, 1956, when he was just 27 years old, Martin Luther King Jr. received a threatening phone call that would cause his life to change forever.

From 1954 until 1960, Martin Luther King Jr. was the pastor of the Dexter Avenue King Memorial Baptist Church, the only church where MLK pastored and the site where he began his Civil Rights activism.

On April 4, 1968, civil rights leader Martin Luther King, Jr. was shot and killed by a sniper while standing outside his hotel room in Memphis. After attending a memorial service the next day, President Lyndon B. Johnson speaks to the nation about the tragedy in a broadcast from the White House.

The German monk's questioning of Catholic dogma leads to the Protestant Reformation.

On April 5, 1968, in a press conference held the day after the slaying of Martin Luther King Jr., civil rights activist Stokely Carmichael predicts the outbreak of more violence across the nation in retaliation for "white America's biggest mistake."