This has a 50's ring to it when the WWII vets were getting married, buying homes and starting the baby boom. The country was strongly conservative then, also.
And US growth was not all homegrown then, either. The US absorbed lots of postwar immigrants. Since circa 1970, when I first read that the US population crossed the 200 million line, US population has risen to about 300 million. And a sizable minority of those alive in 1970 are no longer alive. Despite the fact that the average age has risen since then, there are plenty of kids around, and the pendulum has swung back a bit toward English-speaking households having a more traditional flavor.