Cultural innovation in american cinema

Inspired by this idea, How is it possible that someone like Donald Trump is getting voters? and Why is trash culture becoming stronger and stronger?, I began a selection of american films each week until November that, in my point of view, represent the best and the worst of american culture.

For some reason american presidential campaings have become very important for those who dream of a better world. What we need most is a cultural innovation, someone who reads the signs of changing times, who understands the constitutional values and who respects people in general.

Sometimes we see cultural innovation in american cinema, often wrapped in a package to please a heterogenous audience. The first part of The More the Merrier, for instance, is about sharing space (renting rooms) and services (cars). Washington is growing fast along with public administration. 
This is more about sharing space and services than defending population growth.  

The second and third parts of the movie are the same old romantic comedy, the boy and the girl, both beautiful, both sexy, both childish (especially the girl). :) I'm not saying I don't like romantic comedies because I really do, but let's face it, the first part leads us to expect more...