Participants of the Americanitis Survey were given a brief history of the disease and were given a list of 19th C. Causes selected from William S.Sadler M.D.'s " AMERICANITIS - BLOOD Pressure and Nerves" 1925. Wm. Sadler traveled the country lecturing on Americanitis 30 years.
Yellow blob mass corresponds to the percentage of respondents who recognize these symptoms as enduring causes. "Early 21st century causes" represent participant's hand written contemporary causes.