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.
Polio is a viral disease that affects the nervous system, causing paralysis. It spreads through direct contact with people who have the infection. The first major polio epidemic in the United States occurred in 1916 and reached its peak in 1952. Of the 57,628 reported cases, there were 3,145 deaths.