Nowadays, with history not being taught anymore in American public schools, self-esteem is taking its place.
America may be the best country in the world, but that's kind of like being the valedictorian of summer school.
At some point you cannot be the kid in the glass bubble in this world. You might've heard throughout your grade school and high school years that it was a safe, nice, warm, fair, feeling place... but it can get brutal when it gets competitive. Especially when you succeed. Watch the detractors come out of the walls at that point.