“…Basically, as used here for racial/ ethnic groups, diversity is equivalent to the idea of heterogeneity as often more broadly invoked in sociology (e.g., Blau 1977;Blau and Schwartz 1984;Laumann 1973). All else equal, we expect greater diversity to lead to increased multiracial reporting because increased diversity (or heterogeneity, more broadly) tends to promote more frequent intergroup associations and greater tolerance, results often noted in the sociological literature (Allport 1954;Blalock 1967;Blau 1977;Massey, Hodson, and Sekulic 1999). In fact, it is precisely the lack of racial/ethnic tolerance in the Deep South that has tended to constrain the reporting of multiracial mixing, as noted above.…”