What were the background and circumstances of plessy vs ferguson

The state of Louisiana enacted a law that required separate railway cars for blacks and whites. In 1892, Homer Adolph Plessy-- who was seven-eighths Caucasian-- took a seat in a "white's only" car of a Louisiana train. He refused to move to the car reserved for blacks and was arrested.
QUESTION:
Is Louisiana's law mandating racial segregation on its trains an unconstitutional infringement on both the privileges and immunities and the equal protection clauses of the 14th amendment. (Is it unconstitutional, basically.)
ANSWER: No the state law is within constitutional boundaries. The judges based their decision on the separate-but-equal doctrine (keep in mind this was in 1896), that separate facilities for blacks and whites satisfied the Fourteenth Amendment so long as they were equal.  In this case, they ruled that segregation does not, in itself, constitute unlawful discrimination.

Basically everything about Plessey v. Ferguson.