On why the idea of a long peace in the 19th century is illusory see the classic essay by Geyer and bright "Global V… https://t.co/7NsRS0azYI
How vaccines crushed polio in the US in the mid 1950s and measles in Nigeria after 2005. economist.com/graphic-detail… https://t.co/f3AsZRcEVV
How vaccines crushed polio in the US in the mid 1950s and measles in Nigeria after 2005. economist.com/graphic-detail… https://t.co/f3AsZRcEVV