what are the political and social trends from westward expansion
http://www.google.com/search?q=US+westward+expansion&rlz=1C1GGGE_enUS379US379&aq=f&sugexp=chrome,mod=10&sourceid=chrome&ie=UTF-8
and
http://en.wikipedia.org/wiki/Westward_Expansion
Read carefully, including the references and external links at the bottom of this webpage.
Let us know what you decide to write.