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.

1920 census

the census was scheduled for january the 1st, as the government believed that more farmers would be in their homes by that time instead of april. the census did not ask about unemployment, the number of children, and how long was a couple married were not taken into consideration. individuals were considered as residents of the places they normally slept, not the places were they worked at or visited.

2010 census

the census was scheduled for april 1st, 2010. it was the shortest census in history: it only contained 10 questions related to name, age, gender, ethnicity, relationship, and whether the citizen owned a home or rented one. the government launched a website in order to provide the citizens with information regarding the census. there were also "teach census weeks" in schools nationwide.