April 11 1968 President Johnson signs the 1968 Civil Rights Act.

http://www.sciencedirect.com/science/article/pii/S0962629815000608

Political Geography

Volume 48, September 2015, Pages 146–158

Interventions on the 50th anniversaries of events in the American Civil Rights Movement

• Gerald R. Webster^{a, ,} ,
• Peyton McCrary^b,
• Toby Moore^b,
• Leah C. Aden^c,
• James U. Blacksher^d,
• Michael L. Clemons^e,
• Jonathan I. Leib^e