The effect of the "Plessy" ruling was immediate; there were already significant differences in funding for the segregated school system, which continued into the 20th century; states consistently underfunded black schools, providing them with substandard buildings, textbooks, and supplies. States which had successfully integrated elements of their society abruptly adopted oppressive legislation that erased reconstruction era efforts. The principles of "Plessy v. Ferguson" were affirmed in "Lum v. Rice" (1927), which upheld the right of a Mississippi public school for white children to exclude a Chinese American girl. Despite the laws enforcing compulsory education, and the lack of public schools for Chinese children in Lum's area, the Supreme Court ruled that she had the choice to attend a private school. Jim Crow laws and practices spread northward in response to a second wave of African-American migration from the South to northern and midwestern cities. Some established de jure segregated educational facilities, separate public institutions such as hotels and restaurants, separate beaches among other public facilities, and restrictions on interracial marriage, but in other cases segregation in the North was related to unstated practices and operated on a de facto basis, although not by law, among numerous other facets of daily life.