Population composition refers to the demographic makeup of persons within a geographic area. The composition of an area's population is useful in projecting the incidence of disease and death, and thus health care needs and demand. ... Knowledge regarding changing demographic composition over time is also important. Population data is essential for planning purposes. Any country needs to know the size and composition of its population – around age and sex structure, among other factors. ... That helps to plan how many schools, clinics, hospitals and jobs a country needs.
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In its decision, the Supreme Court overruled the Plessy v Ferguson by ruling that the separation of children in public schools on the basis of race was unconstitutional. This ended racial segregation in public schools
