In the Elizabethan great chain of being, it was "minerals" that were at the lowest rung of human society, since it was believed that these were the foundations of plant life and nothing more.
The renaissance made a big deal
A form of discrimination that is upheld by the law is called legal discrimination.
De facto segregation refers to segregation that occurred by fact, as opposed to by law. Jim Crow laws refer to laws upheld slavery, and segregated and discriminated against those who would later become African Americans.
The Romans Government became more democratic by the revolt of the plebeians. The patrician's strangle hold on power was broken and the plebeians gained rights.
Hope this helps :D