Am I allowed to put a link to my articles on Infobarrel and Xomba in my hubs, or only on my webpage?

You can put links anywhere you like, but it depends what you are trying to do as to which is the most effective way to place the links. If your main place of writing is here on Hubpages then you want one way links from infobarrel and xomba pointing here and none back so that google sees this as the most important place for your writing.. I hope that made some sense..

Yes you are allowed to put a link in your profile. Many people use their profile to take advantage of the opportunity to showcase their work. Make it tasteful and not overpowering, and you may even get some back-links as a result.

I meant to say profile page instead of webpage.

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.