I don't know if he did, but I do know that you are required. It would be considered a derrivative work of the photograph. Derivative works, according to the United States|U.S. Copyright Act of 1976, Section 101 are defined as follows: "A 'derivative work' is a work based upon one or more pre-existing works, such as a translation, musical arrangement, dramatization, fictionalization, motion picture version, sound recording, art reproduction, abridgment, condensation, or any other form in which a work may be recast, transformed, or adapted.
A work consisting of editorial revisions, annotations, elaborations, or other modifications, which, as a whole, represent an original work of authorship, is a 'derivative work'". According to U.S. Copyright Act of 1976, Section 106:"(T)he owner of copyright under this title has the exclusive rights to do and to authorize any of the following: (...) (2) to prepare derivative works based upon the copyrighted work". The only way to get around this is if if the photograph depicts nothing but the artistic work and is indistinguishable from other photographs of the same work.
Otherwise, you will generally need permission from the owner of copyright in the photograph. Since there is nothing to distinguish this photograph from 100s of other photographs of Barack Obama|Obama, he may have gotten around the copyright issue.
This article should answer your question: latimes.com/news/local/la-na-obama-poste....
I cant really gove you an answer,but what I can give you is a way to a solution, that is you have to find the anglde that you relate to or peaks your interest. A good paper is one that people get drawn into because it reaches them ln some way.As for me WW11 to me, I think of the holocaust and the effect it had on the survivors, their families and those who stood by and did nothing until it was too late.