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.
Experts at the Centers for Disease Control and Prevention report the flu reached epidemic levels in the US in December: 7% of all deaths reported were from flu and pneumonia cases. The flu gave Californians a deadly pounding â the virus has killed 42 people under the age of 65 there.