If this is how you've presented the question, Its a bit hard to answer it when one hasn't read these books. It'd be best if you'd put both books into a summary for us to go based off of, at most.
It also can be called a statement unless you use it or say it in a different way
In Village Life in America and A Confederate Girl's Diary, both young girls are going through a time of war. They both have times where they are afraid, and they both want the war to end as soon as possible.
This is just the similarity because It's been a while since I read them. good luck!
The stance, position, or idea the writer is explaining/proving to audiences and the subtopics (reasons) that will be used to do so.
What is this the Definition of?
An argument