Thanks, I will look into those. I know that my question may seem vague. But basically, a "world"(may be island, region, or planet) with teens that would parallel somewhat the normal world. Of course their early decisions will affect everything. And if I can write one book worth anything then I plan on having a series with different character arcs. I just didn't want too much fantasy in my "research" books. Very light is OK. Hope this describes it better than first post.
Tomorrow When the War Began seems close enough. My "world" will be more of a closed system . For the most part any antagonists will be teen(s) of the same world and not teens as a group versus external or adult enemy.
Eric