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.
In contrast, our latest flu pandemic - the H1N1 (swine flu) pandemic - caused the deaths of at least 16,000 people around the world between April 2009 and February 2010. However, the actual number of flu deaths is likely much higher because many people that died from this flu were not tested for it.