The 1918 influenza pandemic killed an estimated 50-100 million people worldwide. The 'Spanish' label arose not because Spain was the source but because Madrid newspapers — uncensored by wartime press restrictions — reported freely on the outbreak. Three competing origin hypotheses have been advanced: Camp Funston, Kansas (USA); the Étaples British Army camp in France; and a Chinese-labour-corps theory. Genetic phylogenetic analysis has reconstructed the H1N1 genome but has not resolved the geographic origin debate. The origin remains scientifically contested among researchers.