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.
Bubonic plague killed 137 million Europeans. European diseases such as smallpox decimated Native American populations. One quarter of delivering mothers died of infections carried by hands and instruments of nurses and physicians. Influenza epidemic of 1918 killed over 25 million people worldwide.