Help! Urgent!
"Some historians today express sorrow at the kind of prideful segregation in America, saying that the clinging to ethnicity, in background and custom, has undermined the concept of unity" What does this mean?

Ineed ! i need this answer quick. which number is main idea? 3. (1) eating habits differ widely from one culture to another. (2) many japanese relish toasted grasshoppers, and members of some brazilian tribes enjoy eating ants. (3) if you find such fare disgusting, bear in mind that many europeans consider corn on the cob fit only for nonhuman animals, and many asians and africans reject cheese because they find it too smelly. (4) it’s socially acceptable to eat dog flesh in korea and horse flesh in france. (5) the thought of eating either offends most westerners. (6) orthodox jews and muslims avoid eating pork, which they consider sinful and unclean, and orthodox hindus—vegetarians who regard cows as sacred—find beef particularly offensive.