The topic is mediation, which basically is comparing the media's portrayal of something vs. the reality of it. An example would be how old western movies show native americans vs. they're actual history. Help is appreciated.
Castles made of sand
Fall to the sea
You could do a lot with war like what the poster above said about romanticism in WW2 and how it has been portrayed by the news in order to increase support for whichever one was going on at the time, for example how during the start of the 1900s, yellow journalism created false and sensationalized headlines about Spain's alleged atrocities in Cuba and essentially spurred the public to clamor for the Spanish-American war versus what really was going on, e.g. Spain didn't really destroy the U.S.S. Maine yet that was one of the main causes for going to war with them, blah blah blah.
Or if you ever saw that Brady Bunch episode (yes, lame but your western movie statement about the Native Americans made me remember) about how Jessie James was depicted as this great American hero in the old movies when in reality he was a murderer and thief.
Or you could write about how rap music and artists, especially in the early '90s, portray gang life in the ghetto as glamorous and killing people and dealing drugs as cool, valid ways of making it through life.
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how about the way your entire country generalizes a culture by the actions of a few, citing any Americans idea of a middle eastern person.