Historical limited - Roman Republic, British Empire
Historical unlimited - Soviet Union under Stalin, Nazi Germany, China under Mao, Roman Empire under Augustus
Contemporary limited - USA, France, Germany, (any nation with a constitution or seperated powers)
Contemporary Unlimited - North Korea
some of the problem is the salt in the water dissolve and there is currently no technology in the world that can remove the salt and because you can't remove the salt then you can drink it
(P.S. if you find a way what happen if you drink all of it up? 0_0 0_o)
Any sources (primary or secondary)
The Nazi people were less likely got executed in the concentration camps. The main target of the concentration camps were the Jews, Romani, homosexuals and criminals. These concentration camps were created after Hitler took control of Germany. Many people were killed in these concentration camps.