87757
The series faced a tough challenge : convincing a recently non-interventionist nation of the need to become involved in the war and ally with the Soviets , among other things .
 None
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:  
Answer:
 None