And this same widening gulf—which is due to the length and expense of the higher educational process and the increased facilities for and temptations towards refined habits on the part of the rich—will make that exchange between class and class, that promotion by intermarriage which at present retards the splitting of our species along lines of social stratification, less and less frequent.
There are no more uses of "stratified" in the book.
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Middle Schools are stratified into cliques of different types of students.
Hopeful signs that increased interracial marriage will decrease racial stratification.