Some historians disagree that genocide, defined as a crime of intent, should be used to describe the colonization experience. Stafford Poole, a research historian, wrote: "There are other terms to describe what happened in the Western Hemisphere, but genocide is not one of them. It is a good propaganda term in an age where slogans and shouting have replaced reflection and learning, but to use it in this context is to cheapen both the word itself and the appalling experiences of the Jews and Armenians, to mention but two of the major victims of this century." Noble David Cook, writing about the Black Legend and the conquest of the Americas wrote, "There were too few Spaniards to have killed the millions who were reported to have died in the first century after Old and New World contact". He instead estimates that the death toll was caused by diseases like smallpox, which according to some estimates had an 80–90% fatality rate in Native American populations. Political scientist Guenter Lewy says "even if up to 90 percent of the reduction in Indian population was the result of disease, that leaves a sizable death toll caused by mistreatment and violence", however, he rejected calling it genocide stating that