West coast schools told me to write my diversity statement about my socioeconomic factor...trying to write about cultural ties that aren't there sounds trite. Lots of schools like strong cultural ties (I.e. Faye Deal from Stanford).
The midwest schools, however, don't see as many Mexican-Americans as CA, and AZ schools (I am guessing Cubans and Puerto Ricans are more dominant on the East Coast). Me being a third generation American with a Mexican last name is enough for them.