Regarding de facto segregation, which of the following statements best describes the phenomenon as it exists in the United States?
1) There is no such thing as De facto segregation. It is a common misconception.
2) Since the mid-70's, schools have become more segregated in terms of race and income.
3) De facto segregation is not actually a problem; de jure segregation is the type that is most problematic in the United States.
4) De facto segregation was a problem during the 20th century, but it was successfully eradicated in the 1990's.