The phrase "racial subgroups" refers to smaller groups within a larger race or ethnic group, based on characteristics such as ancestry, language, or culture. Full definition
Thomas J. Kane and Douglas O. Staiger, «Unintended Consequences of Racial Subgroup Rules» in Paul E. Peterson and Martin R. West (eds.) (gse.harvard.edu)
I looked at results for racial subgroups such as African Americans and Latinos, not only for the socio - economically disadvantaged umbrella group. (edsource.org)
These are not simply my claims: The preponderance of scientifically verified biological data do not support the substructure of human populations into any discrete, internally consistent racial subgroups. (discovermagazine.com)