Stereotyping is one very common and effective way in which racism is perpetuated. Thus, there is a preponderance of representations of these groups within circumscribed categories, . athletics, entertainment, crime, and so forth. Stereotypes are one-dimensional. They only highlight specific characteristics and these are often used to typify whole groups of people. Other elements, absent from the stereotypes, are similarly absent from the coverage. This leads to a situation where assumptions are made about people on the basis of stereotyping. These assumption can perpetuate exclusion and in extreme cases, can justify forced internment and genocide.
The new century saw a hardening of institutionalized racism and legal discrimination against citizens of African descent in the United States. Throughout this post Civil War period, racial stratification was informally and systemically enforced, in order to solidify the pre-existing social order. Although technically able to vote, poll taxes , pervasive acts of terror such as lynching in the United States (often perpetrated by groups such as the reborn Ku Klux Klan , founded in the Reconstruction South), and discriminatory laws such as grandfather clauses kept black Americans (and many poor whites ) disenfranchised particularly in the South. Furthermore, discrimination extended to state legislation that "allocated vastly unequal financial support" for black and white schools. In addition to this, county officials sometimes redistributed resources earmarked for blacks to white schools, further undermining educational opportunities.  In response to de jure racism, protest and lobbyist groups emerged, most notably, the NAACP (National Association for the Advancement of Colored People) in 1909.