 ******It has nothing to do with ethnicity or country of origin; please don't try to make this into such an issue.  We do occasionally use periods if the non-periodized acronym would be confusing or ambiguous, but I could certainly make an argument that those two article names are indeed contrary to our manual of style.  At any rate, their state of compliance or non-compliance with Wikipedia's house style has no bearing on that of this article; each must be considered on its own merits.    