Nami and usopp hometowns but after the 4 yonkos get defeated I think the new generation won’t care about territory and just sail the seas together and for the most part get along with the new navy. But maybe there won’t be a happy bring the world to peace ending
They won't claim any territory.
At the end of the series Revolutionaries will form new government.
Pirate era would be over(as SHs finds OP and declare the war against WG)
Luffy most probably dies and SHs goes separate ways(like Roger Pirates did).