HOI4 Imperial Federation Guide

Forming the Imperial Federation as the United Kingdom in Hearts of Iron IV is a challenge of speed and planning. You can rush federation event in late 1939 using the fascist shortcut, or opt for a more historical approach by gradually lowering autonomy in the dominions. This guide sets out both routes, explains their tradeoffs, and helps you decide which method fits your style and the payoff you want.

Quick answer

Choose the route you want to use

There are two main approaches to the Imperial Federation: the fastest route using Mosley and the Black Shirts focus, or the more standard path where you play as the UK and manage autonomy reductions.

The rapid method begins on the fascist branch, deliberately triggers a civil war, and leverages unique event chains to bypass much of the imperial setup. After the civil war, you can exploit the Commonwealth Ties focus for a quick jump to federation. This shortcut is only possible if you start on the fascist path and are willing to handle the disorder of an early civil war.

The more typical route sticks with the UK government, lowers autonomy step by step in the dominions, and plays through the intended focus tree. In this approach, you gradually build and lend-lease until your subjects reach integrated puppet status, then use the conference event to unlock federation. This method takes longer but is closer to historical gameplay and leaves you with a more stable empire.

1. Pick fast fascist shortcut for earliest formation Uses Mosley, Black Shirts, triggers civil war 2:36
2. Pick standard path for gradual, stable setup Remains UK, builds industry, lowers autonomy 4:49

Trigger the civil war and bypass the setup tree

If you want to rush the Imperial Federation using the Mosley/Black Shirts route, you can skip much of the normal focus tree.

1. Go down Black Shirts on the Mosley fascist path Unlocks organizer and civil war events 2:36
2. Deliberately trigger the civil war Splits UK, dominions remain with original British tag
3. Declare war on dominions during the civil war Engage all dominion puppets then defeat them 2:36
4. In the peace conference, keep one British puppet alive This enables forming a new faction and avoiding full annexation
5. Rush through the focus tree to Commonwealth Ties This focus bypasses most remaining setup requirements 2:56

Lower subject autonomy as fast as possible

For the regular route, the main bottleneck is getting dominion puppets down to integrated puppet status. The tools for autonomy reduction are supply hub builds and lend-lease.

1. Build supply hubs in subjects' territory Can be placed even in dominions; lowers autonomy 3:51
2. Once world tension allows, use lend-lease with trains and convoys Lend-lease is the main autonomy-lowering option 5:17
3. Prioritize construction projects in puppets Even if limited, every build counts to autonomy 5:47
4. For speed, focus on supply hubs even if factories are more efficient This maximizes IC spent in subjects quickly 6:44
5. Keep special attention on the British Raj India is often the slowest subject to knock down 8:09

Handle India without losing the run

Skipping Indian autonomy is the fastest method. If you don't do Indian autonomy, the British Raj will become independent and the federation event will skip them. The Imperial Conference branch is where India can say no; Imperial Federation itself does not give cores on India, so annexing them later yields only non-core territory, leading to resistance.

Opting to include Indian autonomy is slower but results in a more historical federation, with India as a dominion before integration. The choice affects both the timing and the post-federation state: skipping Raj means faster formation but more problems after annexation, while including Raj delays federation but makes the empire more complete and stable.

A purely historical approach may still include Indian autonomy if you prefer a realistic Commonwealth with post-formation stability and less resistance.

Time the Imperial Conference and Commonwealth Ties

Timing is crucial for maximizing the Imperial Federation benefits. The Imperial Conference introduces a significant minus 100 relation penalty with subjects, so after the event, relations must be raised again to unlock the federation.

Imperial Federation, when triggered, applies a minus 3 daily autonomy progress modifier on subjects, hastening integration. Doing the conference earlier is usually better if you are skipping India, as it starts the autonomy reduction immediately.

Commonwealth Ties is the specific focus that lets you bypass most setup if you follow the shortcut route. Line up the conference so that the federation decision becomes available directly after relations are repaired.

1. Hold Imperial Conference to trigger event sequence Applies a major relations reduction 7:13
2. Immediately begin improving relations with subjects Essential so federation event can fire 7:41
3. Trigger Imperial Federation after relations recover Federation applies minus daily autonomy to all subjects 7:41
4. If skipping India, do conference as early as possible Starts autonomy reduction sooner
5. Select Commonwealth Ties in the focus tree for bypass option This unlocks the speedrun federation path 2:56

Set expectations for the payoff

The fastest rush route shown manages the Imperial Federation by 25 October 1939. This result was not claimed to be fully optimal—practice and small adjustments could shorten it further.

If you skip normal factory growth and spend early game on supply hubs and autonomy reduction, your starting economy will be weaker than a typical UK build. However, even with these limits, you can reach a strong industry by federation and stay viable against Germany and Italy. The focus of the rush path is speed rather than full development, so only take this route if you want a fast federation rather than a powerhouse start.

Use a practical benchmark for a historical UK game

If you prefer a more historical, stable empire, use 25 October 1949 as a reasonable challenge date for completion. The guide's author invites players to test faster routes and report results; a viable historical UK run can still end with a functioning economy and solid global position. The goal is to find a streamlined, practical path—not just to copy the rush sequence.

A historical setup may involve letting dominions finish their focus trees for resource bonuses, and waiting longer for autonomy reduction so your post-federation empire is more prepared for world events. Consider this date a benchmark rather than a strict speedrun record.

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