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 CDC claims that deaths due to the annual flu range from 3,000 to 49,000 deaths each year. As can be seen from the graphic above, which is a screen shot of selected text directly from the CDC's own website, the CDC claims they don't really know how many people die from the flu each year.