Spanish flu was a US virus that started in the U.S.

While it’s unlikely that the “Spanish Flu” originated in Spain, scientists are still unsure of its source. France, China and Britain have all been suggested as the potential birthplace of the virus, as has the United States, where the first known case was reported at a military base in Kansas on March 11, 1918. Researchers have also conducted extensive studies on the remains of victims of the pandemic, but they have yet to discover why the strain that ravaged the world in 1918 was so lethal.