It's a given that ideology and propaganda are phenomena of other cultures. They don't exist in the United States.
Class is in the same category.
It's kind of interesting the way it works. Statistics about things like quality of life, infant mortality, life expectancy, etc. are usually broken down by race. It always turns out that blacks have horrible statistics as compared with whites. But an interesting study was done by Vicente Navarro, a professor at Johns Hopkins who works on public health issues. He decided to reanalyze the statistics, separating out the factors of race and class.