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Later it was found that morphine was more addictive than either alcohol or opium , and its extensive use during the American Civil War allegedly resulted in over 400,000 sufferers from the " soldier 's disease " of morphine addiction .
 event: American Civil War
Please list all entity words in the text that fit the category.Output format is "type1: word1; type2: word2". 
Option: media, plant, vehicle, astronomical object, time, disease, animal, location, person, organization, mythical figure, food, biology, geographical phenomenon, instrument, event 
Text: {0} 
Answer:
 event: American Civil War