Question

what are some ways in which American society is stratified?

Please tell us your thinking about this answer and we'll be glad to critque it.
Think -- money, power, race, gender

I searched Google under the key words "<I>social stratification</I>" to get these possible sources:

http://en.wikipedia.org/wiki/Social_stratification
http://www.trinity.edu/mkearl/strat.html
(Broken Link Removed)

I hope this helps you to come to some answers of your own. Thanks for asking.