This short video about the impact of John Watson (not to be confused with James Watson of DNA structure discovery fame) and his theories of behaviorism on American culture.
Even today, Americans have a strongly-held belief that parents and childhood environment really do matter. This is not to imply that they don't; as the video description states, most psychologists today take a hybrid view of the influence of genetics and environment.
Another interesting note is that John Watson eventually left academia (after the fallout from an affair) for the advertising industry. There, he made lots more money and had considerable impact on American advertising.