Wraithguard, you make a good point. That would leave (if my calculations are correct) 2 from each of these
races. I think
Sauron could have chosen anyone, and this would have affected less people. Although, if he wanted already strong or powerful people, why not go a military person high up? Or a tactician/advisor to the king of each region. This would also give him an advantage by knowing some of the secrets of each land. Does it say anywhere in HOME about a major
Numenorean dissapearing at any time, or wouldn't it matter to them? They would most likely make up some story of them going crazy, and leaving, not thinking that they were working for Sauron.
However, doesn't someone (
Aragorn or
Gandalf) say in FotR that they were once
kings? So maybe the rings were handed out over three generations, to each different king? And if Sauron asked the
Haradrim (unlikely
Numenoreans would say yes to him) and the
Easterlings whether they wanted to be more powerful than their enemies, would they voluntarily take the Rings and use them to attack foes?