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.
Lawrence Solomon of the Huffington Post in Canada has written a very insightful analysis of the U.S. Centers for Disease Control's (CDC) annual estimates of deaths due to influenza. The CDC claims that deaths due to the annual flu range from 3,000 to 49,000 deaths each year.