I grew up in Europe and then moved to US. In US, at least in some context (college admissions for example), there is a thing called affirmative action. It seems in order to right a a wrong from the past, or to promote diversity they would sometimes have quotas on how many students from each background to pick. So depending just on race, one could have an easier or much harder way getting accepted. Therefore people would play that card in order to game the system.