79622
This event , and the virtually contemporaneous occurrence of the American Civil War ( 1861 – 1864 ) , which threatened to , and then did , put an end to slavery , coincided with a polarization of attitudes exemplified by the phenomenon of scientific racism .
 American Civil War
Please list all entity words in the text that fit the category. Output format is "word1, word2". 
Option: media, plant, vehicle, astronomical object, time, disease, animal, location, person, organization, mythical figure, food, biology, geographical phenomenon, instrument, event 
Text: {0} 
Answer:
 American Civil War