Which anime has the best world-building?

Good world-building is the stuff you never needed explained: who governs, who pays, what the map looks like past the horizon. Which anime built the world you would most want a guidebook to?

1

One Piece

Islands, governments, ancient history and a map that keeps paying off decades later.

2

Naruto

Five hidden villages with their own politics, economies and grudges.

3

Bleach

Three realms stacked on each other, each with its own bureaucracy.

4

Fullmetal Alchemist: Brotherhood

A military state whose founding crime is the plot.

5

Attack on Titan

Three walls, a hidden continent and a history that reframes everything twice.

6

Hunter x Hunter (2011)

A licensing exam, an auction economy and a Dark Continent barely glimpsed.

7

Made in Abyss

A hole in the ground with its own layers, curses and ecology.

8

Mushishi

A quiet natural order where spirits behave like weather and disease.

9

Legend of the Galactic Heroes

Two star nations, their parliaments and their fleets, argued about in detail.

10

Cowboy Bebop

A lived-in solar system where the bounty economy explains everything.

11

Ghost in the Shell: Stand Alone Complex

A network state where the politics and the cybernetics are the same subject.

12

Vinland Saga

Eleventh-century Europe rendered as economics, farming and cold weather.

13

Jujutsu Kaisen

A sorcerer bureaucracy with clans, exams and paperwork behind the fights.

14

Spice and Wolf

A medieval trade route where currency debasement is the antagonist.

15

Nausicaä of the Valley of the Wind

A poisoned ecology explained well enough to feel like a real biology.