105565
He was a delegate to the State constitutional convention in 1850 , and a member of the peace conference of 1861 held in Washington , D.C. , in an effort to devise means to prevent the impending American Civil War .
 location: Washington , D.C.
Given options, please tell me the categories of all the listed entity words.Output format is "type1: word1; type2: word2". 
Option: location, person, organization 
Text: {0} 
 Entities: Washington , D.C. 
Answer:
 location: Washington , D.C.