In my experience as an American, most of the parades I'm personally familiar with are organized by local groups rather than the government. Maybe you can read some ideology into the American Legion marching with flags, but it's more an exercise in giving the local high school band a chance to march, the Shriners an excuse to break out their clown cars, and maybe the whole thing is an advertisement for the 4H or FFA fair. That's not to say that the US doesn't have parades in the genre the article talks about—the Army 250th Anniversary Parade probably counts. But not every parade is a propaganda exercise.