Nigerian nationalism most serious threat to the Nigerian unity since Nigeria became independent in 1960, as other ethnic groups threatened that they too would also seek secession should Biafra successfully secede. Nigeria responded to the separatist threat with a military campaign against the Biafran government, resulting in the Nigerian Civil War from 1967 to 1970. The war ended with the defeat of the Biafran separatists. Between one and three million Nigerians died in the war. The 19th century did not witness the emergence of any political organization that could help in airing the grievances and expressing the aspirations of Nigerians on a
World War II casualties decline in births are not included with the total dead. The distinction between military and civilian casualties caused directly by warfare and collateral damage is not always clear-cut. For nations that suffered huge losses such as the Soviet Union, China, Poland, Germany, and Yugoslavia, sources can give only the total estimated population loss caused by the war and a rough estimate of the breakdown of deaths caused by military activity, crimes against humanity and war-related famine. The casualties listed here include 19 to 25 million war-related famine deaths in the USSR, China, Indonesia, Vietnam, the Philippines, and India that are