Why have labor-force participation rates for women in the United States increased since World War II while labor-force participation rates for men have decreased?

Causes of the increase in the U.S. women's labor-force participation rate over the past several decades include new technologies that have reduced the amount of time required to complete routine household tasks, improved birth control, and changing political and social attitudes. Causes of the decline in the U.S. men's labor-force participation rate over the past several decades include young men now staying in school longer than their fathers and grandfathers did, older men now retiring earlier and living longer, and more fathers now staying at home to raise their children.