Speaking hypothetical it depends on where you live, loyalty, and money. As long as your white period. I say location because then it may not be any AB in that pen.
So say I wound up in the pen in say California based on my ethnic background being 25% Italian, 25% Finnish and 50% Irish/British Isles I would be able to join the AB if I was loyal? Sorry if it sounds like I am repeating myself I am just interested in looking at this from an anthropological/sociological perspective.
