There s a difference between indirect and direct killing Some Jews did die of disease though primarily by gassing and secondly by shooting but that s because they were rounded up and put in camps and starved Native Americans died of diseases because they had no immunity whatsoever not because they were injected with typhus or starved Though the death toll of Natives was large and the destruction of their culture tragic this was over hundreds of years and mostly indirect deaths I agree that America engaged in ethnic cleansing but most scholars do not consider it a genocide Genocide implies intent Though American policy was racist towards Native Americans there has never been evidence that the US intended to destroy them as a people