colonialism and post colonialism

http://en.wikipedia.org/wiki/Postcolonialism
http://dl.dropbox.com/u/3686063/A2%20Revision%20Media/Media%20A-Z%20Keywords.pdf
http://www.tandfonline.com/doi/abs/10.1080/09528829908576791
http://shura.shu.ac.uk/3538/1/Chapter_1.pdf

Summary 
colonialism refers to a period of history during the 15th-20th century, when they built colonies on other countries. - for profits, to expand power or convert religion. For example British empire
Post colonialism is a period after colonialism. Undermines western thinking. its which former colonies find themselves as they struggle toward a national and ethnic identity in the face of their colonial cultural legacy and the continuing dominance of western media cultural imperialism.Post colonial experience involves the challenged the language, identities etc. constructed during the colonial period and hence creating a own independent voice. Alvardo who talks about Racial representation. Frantz fanon who talks about wearing the white mask. or Said.