13494
A freed black man writes to his still-enslaved wife , a mother pleads with Abraham Lincoln on behalf of her son and a maimed soldier poses for an official photograph in newly reopened records that bring the U.S. Civil War back to life .
 Abraham Lincoln, U.S. Civil War
Please list all entity words in the text that fit the category. Output format is "word1, word2". 
Option: location, else, organization, person 
Text: {0} 
Answer:
 Abraham Lincoln, U.S. Civil War