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High Quality Content by WIKIPEDIA articles! Population decline (sometimes known as depopulation) is the reduction over time in a region's census. It can be caused for several reasons; notable ones include sub-replacement fertility (along with limited immigration), heavy emigration, disease, famine and war. Prior to the 20th century, population decline was mostly observed due to disease or starvation. The Black Death in Europe, the arrival of Old World diseases to the Americas, the tsetse fly invasion of the Waterberg Massif in South Africa, and the Great Irish Famine have all caused sizable…mehr

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High Quality Content by WIKIPEDIA articles! Population decline (sometimes known as depopulation) is the reduction over time in a region's census. It can be caused for several reasons; notable ones include sub-replacement fertility (along with limited immigration), heavy emigration, disease, famine and war. Prior to the 20th century, population decline was mostly observed due to disease or starvation. The Black Death in Europe, the arrival of Old World diseases to the Americas, the tsetse fly invasion of the Waterberg Massif in South Africa, and the Great Irish Famine have all caused sizable population declines. In modern times, the AIDS epidemic has caused declines in the population of some African countries. Less frequently, population declines are caused by genocide or mass execution; for example, in the 1970s, the population of Cambodia underwent a period of decline due to wide-scale executions by the Khmer Rouge.