Why did Oliver Brown sue the state of Kansas? *

Because schools for black children were not equal to the white schools.

Explanation:

And that segregation also violated the so-called “equal protection clause” of the 14th Amendment, which holds that no state can “deny to any person within its jurisdiction the equal protection of the laws.”

explanation:

a trial judge has broad powers in his courtroom. the judge's decision is usually final for the duration of the trial, and the party's one special type of witness is an expert witness.