I think we were able to strike a chord with nationalist tendencies, which can be strong motivators, for public infrastructure during the New Deal era with the PWA and WPA and their associated propaganda. There was both a personal pride in bettering oneself with hard work, and larger shared pride of building huge, sometimes incredible feats of engineering, infrastructure that your neighbors and nation depend on, and quite literally rebuilding the nation for a new modern era.

There are already some related things in popular culture that seem to inspire younger generations, like new urbanism. The hope for a new way of living can be a huge motivating force.