Games like Millenium State: Path of Hegemony
Games like Millenium State: Path of Hegemony include Crusader Kings III, Europa Universalis IV, Hearts of Iron IV, Europa Universalis V, and Age of History 3. We matched them by the tags players give Millenium State: Path of Hegemony on Steam (Grand Strategy, Strategy, Singleplayer, RPG, and Choices Matter): closest matches first, and among equally close ones the better-known games.

Crusader Kings III
Shared: Strategy · Grand Strategy · RPG

Europa Universalis IV
Shared: Grand Strategy · Strategy · Alternate History

Hearts of Iron IV
Shared: Strategy · Grand Strategy · Alternate History

Europa Universalis V
Shared: Grand Strategy · Strategy · Wargame

Age of History 3
Shared: Strategy · Grand Strategy · Wargame

Crusader Kings II
Shared: Grand Strategy · Strategy · RPG

Sid Meier’s Civilization® VI
Shared: Strategy · Grand Strategy · Singleplayer

Kingdom Come: Deliverance II
Shared: RPG · Singleplayer · Realistic

Total War: WARHAMMER II
Shared: Strategy · Grand Strategy · Singleplayer

Mount & Blade II: Bannerlord
Shared: Strategy · RPG · Singleplayer

Baldur's Gate 3
Shared: RPG · Choices Matter · Strategy

Kingdom Come: Deliverance
Shared: RPG · Singleplayer · Realistic

Imperator: Rome
Shared: Grand Strategy · Strategy · Singleplayer

Total War: WARHAMMER
Shared: Strategy · RPG · Grand Strategy

Heroes of Might and Magic: Olden Era
Shared: Strategy · RPG · Grand Strategy

Legend of Mortal
Shared: RPG · Choices Matter · Singleplayer

Battle Brothers
Shared: Strategy · RPG · Grand Strategy

Dragon Age: Origins - Ultimate Edition
Shared: RPG · Singleplayer · Choices Matter

Heroes' Vow: Three Kingdoms
Shared: Strategy · RPG · Grand Strategy

XCOM 2
Shared: Strategy · RPG · Singleplayer

Age of History II
Shared: Strategy · Grand Strategy · Singleplayer

Quasimorph
Shared: Strategy · RPG · Singleplayer

Mount & Blade: Warband
Shared: Strategy · RPG · Singleplayer

Stellaris
Shared: Strategy · Grand Strategy · Singleplayer