1920's - Birth control becomes available. 1918 - 19th Amendment gives women the right to vote. Early 1960's - Contraceptive pill is widely distributed.
Abortion becomes illegal.
Contraceptives are finally legalized, but info is limited and access is greatly restricted. The difference between chronological origins of feminist movement in France and US can also be explained by their two very different religious heritages. Whereas historically France is considered to be a Catholic nation, the US was founded on Puritan principles. This religious difference has often been used to explain why French and American women differ socially and psychologically. America's Protestant heritage gave women significant role social roles, albeit the roles available were limited to the religious activities.