Dr. Martin Luther King Jr. walks between seven-year-old Eva Gracelemon, left, and 10-year-old Aritha Willis as he escorts black school children to formerly all-white schools in Grenada, Miss., Tuesday morning, Sept. 20, 1966.  Violence erupted at the school last Monday when the schools were integrated. (AP Photo)

Today in History: September 20

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Today is Tuesday, Sept. 20, the 264th day of 2016. There are 102 days left in the year.

British Conservative Party Leader Margaret Thatcher listens and answers reporters questions during a press conference on Wednesday, Sept. 14, 1977 at the Great Britain Embassy in Washington. Mrs. Thatcher is here on a three-day visit meeting with President Carter and other high administration officials. (AP Photo/Peter Bregg)

Today in History: September 14

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Today is Wednesday, Sept. 14, the 258th day of 2016. There are 108 days left in the year.

New York State troopers and prison guards prepare to enter Attica State Prison in Attica, New York, to quell a riot of prisoners, Sept. 13, 1971. (AP Photo)

Today in History: September 13

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Today is Tuesday, Sept. 13, the 257th day of 2016. There are 109 days left in the year.

Sen. John F. Kennedy (D-MA) and his bride, the former Jacqueline Lee Bouvier, leave St. Mary's Catholic Church following their wedding in Newport, RI, September 12, 1953.  Archbishop Richard J. Cushing of Boston officiated at the ceremony.  (AP Photo)

Today in History: September 12

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Today is Monday, Sept. 12, the 256th day of 2016. There are 110 days left in the year.