If we assume that humans are the same and easily manipulated, then that makes our population no different from the Russians or Chinese who are manipulated by nationalism and patriotism.
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We are ALL manipulated to some degree, whether we like to admit it or not. Every one of us, without exception.
And I’m not sure where the idea that Americans are less susceptible to manipulation than other countries, not sure that is true at all. Look at the facts: most Americans continue to this day to believe in a supreme being that lives forever up in the sky and watches the every move of billions of people. American adults gave up believing in Santa and the Tooth Fairy before hitting puberty, but they continue to be manipulated by organized religion throughout their lives.