Diversity is not a strength. It has been shoved down people's throats for way too long and it's backfiring. Having too many cultures changes the fabric of American culture. It separates people, causes tension, conflict, and wastes tons of money shoving it down people's throats like the article says. Nice read.
"As I would not be a slave, I would not be a master" seems an appropriate response to much of your commentary and was spoken by somebody famous. Would you like the culture you come from omitted from what should be studied and understood as part of the human condition? Should the beautiful Mayflower descendant I pursued five decades ago, be restricted to knowing only her own kind? Must every Sicilian hate every Calabrese, every Litwak know nothing of the life of the Galitz? Imagine walking a mile in the other guys shoes not through the lens of fear and loss but in anticipation of acceptance and achievement. Humans move toward pleasure and away from pain, same as most other organisms, and understanding how that plays out in many cultures enriches one's life.