This New York based political analyst and activist provides an excellent review of the varying uses and methods of US war propaganda since WWII.
...the victims of US aggression all vary in their ideological outlook, religion, history, and circumstances. As has always been the case, regimes are targeted not for ideological reasons, but because they stand for independence from economic domination by Wall Street and London.The US ruling class started seriously using propaganda, which they called "public relations, in the 1920s to serve their interests following their dramatic and surprising success in using propaganda to turn public opinion from strongly opposing US entry into WWI to supporting it.