The 1940s marked the beginning of the predominantly one-way migra­ tion stream of blacks from the South to the North; this movement contin­ ued to the 1970s. (The South lost close to 1.5 million blacks in each of those decades.) One of the major factors contributing to this migration was that the wartime acceleration of the movement of blacks from the South to job opportunities in the industrialized areas of the North. As a further consequence, the geographical distribution of the black popula­ tion changed; by 1970, only 53 percent of blacks lived in the South, and 81 percent lived in urban areas.