“Racial segregation as a way of life did not come about as a natural result of hatred between the races immediately after the Civil War. There were no laws segregating the races then. And as the noted historian, C. Vann Woodward, in his book, The Strange Career of Jim Crow, clearly points out, the segregation of the races was really a political stratagem employed by the emerging Bourbon interests in the South to keep the southern masses divided and southern labor the cheapest in the land. You see, it was a simple thing to keep the poor white masses working for near-starvation wages in the years that followed the Civil War.”
1960s, How Long, Not Long (1965)
Context: Our whole campaign in Alabama has been centered around the right to vote. In focusing the attention of the nation and the world today on the flagrant denial of the right to vote, we are exposing the very origin, the root cause, of racial segregation in the Southland. Racial segregation as a way of life did not come about as a natural result of hatred between the races immediately after the Civil War. There were no laws segregating the races then. And as the noted historian, C. Vann Woodward, in his book, The Strange Career of Jim Crow, clearly points out, the segregation of the races was really a political stratagem employed by the emerging Bourbon interests in the South to keep the southern masses divided and southern labor the cheapest in the land. You see, it was a simple thing to keep the poor white masses working for near-starvation wages in the years that followed the Civil War. Why, if the poor white plantation or mill worker became dissatisfied with his low wages, the plantation or mill owner would merely threaten to fire him and hire former Negro slaves and pay him even less. Thus, the southern wage level was kept almost unbearably low. Toward the end of the Reconstruction era, something very significant happened. That is what was known as the Populist Movement. The leaders of this movement began awakening the poor white masses and the former Negro slaves to the fact that they were being fleeced by the emerging Bourbon interests. Not only that, but they began uniting the Negro and white masses into a voting bloc that threatened to drive the Bourbon interests from the command posts of political power in the South. To meet this threat, the southern aristocracy began immediately to engineer this development of a segregated society. I want you to follow me through here because this is very important to see the roots of racism and the denial of the right to vote. Through their control of mass media, they revised the doctrine of white supremacy. They saturated the thinking of the poor white masses with it, thus clouding their minds to the real issue involved in the Populist Movement. They then directed the placement on the books of the South of laws that made it a crime for Negroes and whites to come together as equals at any level. And that did it. That crippled and eventually destroyed the Populist Movement of the nineteenth century.
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Martin Luther King, Jr. 658
American clergyman, activist, and leader in the American Ci… 1929–1968Related quotes

was an all-black community. And people still lived very segregated lives, I think, because that was all they had always known. And there was still this kind of danger to integrating. So people kind of stayed in the places - the safe places that they had always known.
On still experiencing the aftereffects of segregation in “Jacqueline Woodson On Growing Up, Coming Out And Saying Hi To Strangers” https://www.npr.org/2016/10/14/497953254/jacqueline-woodson-on-growing-up-coming-out-and-saying-hi-to-strangers in NPR (2016 Oct 14)

Closing words from his last speech, Vanderbilt University (April 1989).
Context: In the nineteen-sixties, apartheid was driven out of America. Legal segregation — Jim Crow — ended. We didn't end racism, but we ended legal segregation. We ended the idea that you can send a million soldiers ten thousand miles away to fight in a war that people do not support. We ended the idea that women are second-class citizens. Now, it doesn't matter who sits in the Oval Office. But the big battles that were won in that period of civil war and strife you cannot reverse. We were young, we were reckless, arrogant, silly, headstrong … and we were right! I regret nothing!
Bruce Bartlett, "Whitewash" http://www.wsj.com/articles/SB122513867582273213 (December 2007), The Wall Street Journal
2000s
On how she believes the educational system echoes some of the points that Michelle Alexander raised in “An Interview with Dominique Morisseau” https://www.theintervalny.com/interviews/2017/07/an-interview-with-dominique-morisseau/ in The Interval (2017 Jul 25)

Simkin, John (September 1997). "James Eastland" http://spartacus-educational.com/USAeastland.htm
Speech in the United States Senate after the Brown v. Board of Education landmark court decision (27th May, 1954)
1950s

Source: Take Your Choice, Separation or Mongrelization (1946), Chapter Four: Southern Segregation and the Color Line.
Speech at the launch of the NAP campaign for the 2006 election, Rakiraki, 6 August 2005

" Who Was Margaret Sanger? http://www.ewtn.com/library/prolife/pp04a.txt", brochure published by the American Life League, regarding The Pivot of Civilization http://www.gutenberg.org/files/1689/1689.txt.
None of those quoted phrases actually appear in the book.
Misattributed

Quoted from Fox News interview (8 February 2017} in Ted Cruz: ‘The Democrats are the party of the Ku Klux Klan’ https://www.washingtonpost.com/news/the-fix/wp/2017/02/08/ted-cruz-the-democrats-are-the-party-of-the-ku-klux-klan/?utm_term=.1afc8c04a4ec
2010s