A bold book argues that thousands of American towns were deliberately kept whites-only

Loewen, a sociologist, argues in his powerful and important new book, Sundown Towns... Loewen reports that -- beginning in roughly 1890 with the end of Reconstruction and continuing until the fair-housing legislation of the late 1960s -- whites in America created thousands of whites-only towns, commonly known as "sundown towns" owing to the signs often posted at their city limits that warned, as one did in Hawthorne, Calif., in the 1930s: "Nigger, Don't Let The Sun Set On YOU In Hawthorne." In fact, Loewen claims that, during that 70-year period, outside the traditional South, "probably a majority of all incorporated places [in the United States] kept out African Americans."
Such a bold claim would seem to require an exact count of sundown towns to back it up. But Loewen admits that the challenges of uncovering and confirming the existence of each sundown town -- when everything from census figures to local histories proved misleading -- limited his ability to nail down an exact figure. Instead, he writes, "I believe at least 3,000 and perhaps as many as 15,000 independent towns went sundown in the United States, mostly between 1890 and about 1930."