Look at the map
The novel ends when a world-unifying power controls the world for over a century.
Rules:
-A new protagonist will at most have three secondary characters for each batch of 50 chapters (if he survives) - those who can continue to exist even after the protagonist's death.
-The characters we follow have random birthplaces, following the demographic statistics and the location the previous protagonist was at the switch.
-Each event is random. A character starts with features that definite his probability and choice. At the end of a protagonist, I will show these features/choices he makes.