What was the toll of the spanish flu? what effects did it have?

From 1918-1919 it is the deadliest in modern history it infected 500 million people world wide about 1/3 of the population at the time and killed 20 million to 50 million people

Depression is lifelong, though you can get medication to with it. the difference between sadness and depression is that sadness lasts a little bit, depression last a long time and it goes on and off. people usually get depression through experiences they have been through, or genetics.