*groan*
Kiddies, if you're peevish about the title of the last book, then you have completely missed the meaning that Applegate is attempting to give to it.
Tell me, when a war is over, do you consider it the end of everything? Does the world end when one soldier dies?
When wars end, everybody else FINALLY has the chance to get on with their lives, begin again, rebuild what was broken, and recover as much as possible of what was lost. Reconstruction. The time after a war is known as a reconstruction. It's a beginning.
She's saying, effectively, that for the past near-sixty books, something in this world has been royally effed up, and now at last it is beginning to be right again, albeit not perfectly right.