The dark underside of the United States has taken center stage in several films at Cannes this year, capped on Monday with a scathing attack of past and present racism in America by Danish director Lars von Trier. There are a number of other films that examine dark and depressing aspects of the United States and "American Dream" losers, filled with violence, drugs and alcohol abuse. They were made by directors from the United States, Canada and Europe. Reuters reports.