Merged Worlds: Isekai'd Nation Builder

"Hey, you've been reincarnated." "Really? Why?" "You died before your time." "What does that mean?" "Long story, and usually there is something special for that, but I need to have a retirement system for them cause there's a little too many." "So what am I supposed to do now?" "Just live your life in the world you'll be sent to." "Oh... In that case... I'LL MAKE MY OWN NATION!!" "WHAT!?!?"