In 1948, the gap in labor force participation between American men and women was
54 percentage points—only one-third of American women were officially counted as in the labor force. Nearly seven decades later, the gap has narrowed considerably as women have entered the labor force en masse, and as men have experienced steady declines. As of August 2014, about 57 percent of women were counted as labor force participants, and the gap between men and women had narrowed to only 13 percentage points.
Guidelines for Local and State Governments to Promote Entrepreneurship
Immigration and Entrepreneurship Research from the National Foundation for American Policy