He worked on other Capra films during the following decade, including the comedy "You Can't Take It With You" (1938), "Mr. Smith Goes to Washington" (1939), "Meet John Doe" (1941), and "It's a Wonderful Life" (1946). During World War II, he continued his close collaboration with Capra by composing scores for his "Why We Fight" series. These seven films were commissioned by the US government to show American soldiers the reason for United States' participation in the war. They were later released to the general US public to generate support for American involvement.