多民族国家とはなんですか？
A state may also be a society, and a multiethnic society has people belonging to more than one ethnic group, in contrast to societies that are ethnically homogeneous. By some definitions of "society" and "homogeneous", virtually all contemporary national societies are multiethnic. The scholar David Welsh argued in 1993 that fewer than 20 of the 180 sovereign states then in existence were ethnically and nationally homogeneous, if a homogeneous state was defined as one in which minorities made up less than 5 percent of the population. Sujit Choudhry therefore argues that "[t]he age of the ethnoculturally homogeneous state, if ever there was one, is over".
has people belonging to more than one ethnic group