Kaiserreich transforms Hearts of Iron IV into an alternate history where Germany won World War I. Begin in 1936 and reshape a world divided between the German Empire, the Syndicalist Internationale, a resurgent Russia and rival global powers. Features nearly 200 national focus trees, over 18,000 focuses, 18,000 events, 5,800 decisions, new political and economic mechanics, redesigned territories and thousands of custom portraits and icons.
Contents
- A World Shaped by German Victory
- Nearly 200 National Focus Trees
- Political and Economic Systems
- A Redesigned World Map
- Thousands of Custom Visual Assets
- Alternative History and Replayability
- Continued Development
- Version and Compatibility
- Installation and Troubleshooting
- Rewrite the Twentieth Century
Kaiserreich - Legacy of the Weltkrieg: What If Germany Won World War I?
Kaiserreich is one of the most extensive alternate history modifications for Hearts of Iron IV, exploring a world in which the German Empire emerged victorious from the First World War.
The campaign begins in 1936, seventeen years after the end of the Weltkrieg. Germany dominates the international order, but its apparent supremacy conceals growing political, economic and military instability.
Revolutionary movements, resurgent empires and competing alliances threaten to plunge the world into another devastating conflict.
With nearly 200 national focus trees, thousands of events and extensive political systems, Kaiserreich transforms the familiar historical setting into an alternative twentieth century filled with uncertainty.
A World Shaped by German Victory
Germany's victory in the Weltkrieg fundamentally changed the balance of global power.
By 1936, the German Empire remains the leading international power, supported by an extensive network of allies and dependent states.
However, maintaining this position becomes increasingly difficult.
Major geopolitical forces include:
- The German Empire - The dominant world power, struggling to maintain its vast international influence.
- The Third Internationale - A revolutionary alliance centered on syndicalist France and Britain.
- Russia - A resurgent power seeking to restore its international position.
- The Japanese Empire - An ambitious Asian power challenging the established order.
- The Entente - Former Allied powers attempting to regain lost influence.
- Austria and the Ottoman Empire - Major states confronting their own political challenges.
- The United States - A powerful but increasingly unstable nation facing a profound domestic crisis.
These competing interests create the conditions for new wars, revolutions and diplomatic realignments.
Nearly 200 National Focus Trees
One of Kaiserreich's defining features is its extensive collection of national focus trees.
The modification includes:
- Nearly 200 focus trees covering countries across the world.
- More than 18,000 individual national focuses.
- Approximately 18,000 events.
- 5,800 political and strategic decisions.
Each major nation features its own political struggles, strategic objectives and opportunities for alternative development.
Players can preserve established governments, support revolutionary movements, pursue territorial ambitions or attempt to create new international alliances.
The choices made during a campaign can significantly alter the course of global history.
Political and Economic Systems
Kaiserreich expands Hearts of Iron IV with mechanics designed to represent the complexities of its alternate historical setting.
Important additions include:
- Coalition mechanics - Political systems involving cooperation and competition between different factions.
- Economic spheres - Mechanics representing the influence of major powers over international economic relationships.
- Country-specific political content - Unique events, decisions and national development paths.
- Expanded diplomacy - International relationships shaped by the consequences of the Weltkrieg.
These systems make domestic politics and economic influence important elements of strategic planning.
A Redesigned World Map
The modification introduces changes to the global map, including additional states and provinces.
These adjustments reflect the political borders and territorial arrangements of the Kaiserreich timeline.
The redesigned geography provides a foundation for regional conflicts, territorial disputes and alternative military campaigns.
Thousands of Custom Visual Assets
Kaiserreich features an extensive collection of original and adapted visual content.
The modification includes:
- Over 4,400 hand-colorized leader portraits.
- Thousands of custom national focus icons.
- Unique national idea textures and illustrations.
- Dozens of 3D models.
- Visual content designed to reflect the alternate historical setting.
The artwork helps establish a distinctive identity for the countries, political movements and military forces represented in the game.
Alternative History and Replayability
Kaiserreich emphasizes the freedom to explore different historical possibilities.
A campaign can develop in dramatically different ways depending on political decisions, diplomatic developments and military outcomes.
Players can attempt to preserve German hegemony, support revolutionary powers, restore lost empires or guide smaller countries toward an unexpected rise to prominence.
The combination of extensive national content and dynamic international politics creates significant replayability.
Continued Development
The modification continues to receive new content and improvements.
Planned development priorities include:
- Additional national focus trees for remaining countries.
- Reworks of older national content.
- More events and political decisions.
- Improvements to existing mechanics and gameplay systems.
Version and Compatibility
| Parameter | Details |
|---|---|
| Mod version | 1.7 |
| Release date | September 18, 2026 |
| Supported HOI4 version | Operation Postern 1.19.4.0.48d6 (a783) |
| Mod type | Alternate history total conversion |
| Campaign starting year | 1936 |
| Historical premise | German victory in World War I |
Kaiserreich extensively modifies Hearts of Iron IV, so compatibility with unrelated gameplay overhauls should not be assumed.
Official companion submods, including music additions, are available separately.
Community translation projects also exist for several languages, including Simplified and Traditional Chinese.
Installation and Troubleshooting
If the modification fails to launch, appears outdated or produces a missing descriptor file error, the problem may be related to the Hearts of Iron IV launcher.
Checking the mod installation, launcher configuration and enabled modifications is recommended before attempting to start a new campaign.
Rewrite the Twentieth Century
Kaiserreich - Legacy of the Weltkrieg offers an alternative vision of the modern world, where the outcome of the First World War reshaped every major political and military conflict.
With its enormous collection of national focuses, detailed events, expanded political mechanics and distinctive alternate history, Kaiserreich provides a fundamentally different Hearts of Iron IV experience.
Will the German Empire preserve its supremacy, or will a new world order emerge from the chaos?

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