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.
Bacterial Pneumonia and Viral Infection. The influenza pandemic of 1918 was responsible for the deaths of approximately 40-50 million people worldwide (>600,000 deaths in the United States). Many of the deaths were likely due to secondary bacterial infection.