Given: a variety of group identities are sociologic constructs. Among them racial and religious groupings.
How are these groupings formed?
Bloodlines. For example you are Black or Jewish or Irish-American or whathaveyou because your parents were.
Superficial appearance. Black by virtue of having some external physical characteristics. Meet some stereotype of looking Jewish, etc.
Shared cultural attributes: values, style of dress, speech, attitude.
All well and good and very often all of the above are in agreement. But what happens when these attributes conflict?
As a case study, what makes one “Black” in America?
Is it bloodline, and how much of your bloodline is of African heritage to be Black in America? Why should many prominent “Blacks” be any more declared “Black” than white or Indian given the mix of genetic backgrounds that are in the family trees of most American “Blacks”?
Superficial appearence? Would this qualify someone as “Black” even if they weren’t of African heritage but say some combination of other ethnicities?
Cutural values? What does “acting Black” in today’s America mean?
Please note: this is as a case study. Jewish could be substituted with equal complexity. How many times are we told some famous person was a Jew even though they are entirely areligious or even converted out of the faith, but because they were born to a Jewish parent (and by most Jewish conventions a convert is still a Jew)? Yet my daughter, adopted from China and converted as a baby, is a Jew too.
Irish-American and other national identifications also need apply: bloodline for a national group membership after generations born elswhere? But let’s stick with one case study for now. How is membership in this group determined, what factors override which and why?