Where did it originate?

Black and white photograph of Garfield School in Topeka, Kansas, serving as an emergency hospital, possibly during the Spanish Influenza epidemic. Date: Between 1918 and 1919
The Spanish Influenza outbreak started, not in Spain like the name would lead you to believe, but was traced to Camp Funston, Kansas. The Spanish Flu started in March 1918 and continued through June 1920. More than 25 percent of the US population became sick, and some 675,000 Americans died during the pandemic. If we take every combat casualty since the American Revolution to the Gulf War it would still not total the number of Americans killed by the Spanish Influenza pandemic. The flu spread to all corners of the world from the United States, Europe, Asia, Pacific Islands, and even the Arctic. Many sources refer to this viral infection as an epidemic, but generally an epidemic is slightly more infectious than predicted in a single region. This outbreak was officially a pandemic because the outbreak occurred in several regions across the world. It is becoming easier for epidemics to become pandemics due to globalization. The research of Spanish Flu has been beneficial to scientists, historians, and governments to develop a response to the threat of pandemics globally.