During the 1950s-60s, the US was at the peak of economic development. As the war was over, families got better life prospects and job opportunities. Baby boom followed as a natural consequence. Between 1946 and 1964, 76 million of babies were born. Today this figure still makes up 40% of the American population with all the immigrants of the same age.
Baby boomers changed the American society in many ways. First, they created the mass consumer demand for certain goods and services (toys, education etc). Second, baby boomers created a huge community that set cultural and social trends. Mass support of the Civil Rights Movement, protests against the Vietnam War, hippies, and feminism movement all took place because of the baby boomers.