Question: When did the afghanistan war start and end?
Disambiguated questions and answers: question: When did the afghanistan war first phase start?
When did the afghanistan war first phase  end?
When did the afghanistan war second phase start?
When did the afghanistan war second phase end?
answer: 7 October 2001
28 December 2014
1 January 2015
present
Natural Questions answer: 7 October 2001 -- present (from the Wikipedia article "War in Afghanistan (2001–present)")