Demographic Modern History

Like any other species, we, homo-sapience, has experienced very severe crises such as smallpox in ancient Japan, black plague in middle age Europe, and so on. Historical events with more than ten thousands of victims print their foot mark on demography. In case of historical events we have recorded the number of direct victims but it is well known that in such severe situation not a few people may die due to poor food intake, poor health control and some may kill themselves. From demographic aspects we can estimate these indirect victims by the annual death number comparing with ordinal estimated death.