Depends on what is the content of your Youtube video. Which people do you want to reach? You can post the link of your video on various forums to reach people.It all depends who you want to reach.
In addition to real traffic from youtube and google searches, you can join "sub for sub" programs all over the internet that brings views, subs, and sometimes likes to your YouTube clips. Although this may not be the perfectly ethical solution, it can help in the beginning. Try googleing or search of HubPages about these "sub for sub" programs or check out.
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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.