A: The main cause of rapid population growth is when there are more births than there are deaths, which is referred to as a natural increase. Other causes of ... Full Answer >
Spanish flu (1918-1919). The influenza pandemic of 1918-1919 killed more people than the World War I, at somewhere between 20 and 40 million people. It has been cited as the most devastating epidemic in recorded world history. Known as Spanish Flu or La Grippe the influenza of 1918-1920 was a global disaster.
Alternative Titles: Spanish flu, Spanish influenza pandemic Influenza pandemic of 1918â19, also called Spanish influenza pandemic or Spanish flu, the most severe influenza outbreak of the 20th century and, in terms of total numbers of deaths, among the most devastating pandemics in human history. 1  Influenza is caused by a virus that is transmitted from person to person through airborne respiratory secretions.