Although eugenics programs had been in vogue in many world governments since the advent of Evolutionary Theory, nowhere else was it as effectively mated with ethnic cleansing as it had been in the Nazi Germany of the mid-20th century. By getting rid of genetically "undesirable" persons (based on ethnicity, impairment, or even lifestyle) and selectively breeding those seen as healthy, intelligent, and "Aryan", Adolf Hitler attempted to create an army of Supermen. Although any positive effects this had on his military were due more to propaganda more than to Nazi Germany's (weak) grasp of genetics, it should still be noted that until defeat seemed inevitable, the German army was quite fearsome. The Nazi experiment with enforced eugenics was not the last; several dictatorial Asian nations attempted the same thing in the late 20th and early 21st centuries with similar results. Of course, with such an abhorrent treatment of the population, a system like this had little chance of changing much in the one or two generations allotted to each of these social experiments before the rest of a world put a stop to it.