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.
1957 Asian Flu Pandemic: Over 1 million flu deaths, including about 69,800 in the United States 1968 Hong Kong Flu Pandemic: About 1 to 3 million flu deaths 2009 H1N1 Flu Pandemic: Between 8,870 and 18,300 deaths in the United States and up to 203,000 deaths worldwide The 2009 H1N1 flu pandemic was the first pandemic for which a large supply of flu vaccine was available, although it came as cases were already peaking in the United States.