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.
The deadly duo was the 7th leading cause of death in 1999 and 2000. In September 2001, it was reported that the flu and pneumonia combined killed 63,730 people annually. But you might want to look beyond the numbers.