In Griswold, decided in June, 1965, the Supreme Court ruled 7–2 that Connecticut's ban on contraception was unconstitutional, not on the ground of a woman's right to determine the timing and the number of her pregnancies but on the ground of a married couple's right to privacy
In my view the period that has had the biggest impact on the development of US society is The Great Depression. That depression brought a huge economic growth but also changed mass culture that swept many Americans into consumer society.