Veteran Fever (The Many Nations of North America)

A powerful diseases that used to kill hundreds of peoples throught North America, it can spread so quickly that it brought an end to the The War of Secession and each of it's epidemy had an effect of overall North American Geo-politic (some used to call the most powerful political force in North America). It's characterize by an heavy fever that kill half of those infected by it. It is spread by air.