Film Comparison - 'Do the Right Thing' and 'Casablanca'

The Films 'Casablanca' (https://en.wikipedia.org/wiki/Casablanca_(film)) and 'Do the Right Thing' (https://en.wikipedia.org/wiki/Do_the_Right_Thing) are two very different films, however there are a few very specific comparable themes, the main one being the indifference and instability caused within a collected community composed of two differing factions (,'Casablanca's being the French and German inhabitants of the city and 'Do the Right Thing's being the varying ethnicities featured in the film).
 The main plot of Casablanca follows a man named 'Rick' (mentioned in earlier analytical piece about the film) who runs 'Rick Cafe Americain' which serves as a home for illegal visa deals, within this cafe there are a variety of characters from across the globe, however the two main parties consist of the Germans and the French. The actions featured in 'Casablanca' are undertaken during World War Two, meaning that tension between the two factions was high; the sense of being trapped within enemy territory gives this film a sense of urgency which ultimately forces the stories plot forward where it would have otherwise been quite slow and dull. This feeling of imprisonment can be felt in the film 'Do the Right Thing' as well; the city of New York (shown in all its heated glory) is full of segregation and constant racism as races from across the globe almost contest with each other for equality and recognition. The film (not to much unlike 'Casablanca',) truly captures the stifled anger of a people who cannot escape there current position because a self proclaimed power believes they have the right to say otherwise. Each film conveys the oppression brought about by a supposedly higher ranking people and how it can cause a severe imbalance in the economy and community as a whole.