Opening sentence needs improvement
The current version of the opening sentence needs work. 

Racism is commonly defined as a belief or doctrine where inherent biological differences among the various human races determine cultural or individual achievement, with a corollary that one's own race is superior and has the right to rule others.

It is too wordy, grammatically awkward, and doesn't adequately define the topic. Also, the words are almost the same as the ones that appear in the reference.