The Thirty Years’ War (1618)

The Austrian Empire had solidified its position in Central Europe as the ruling power of the Holy Roman Empire. It maintained long-standing rivalries with the Ottoman Empire and France, while Habsburg kings held important thrones in Spain, Hungary, Bohemia, Croatia, Portugal, the Netherlands, and several smaller kingdoms and principalities in the yet-unified Italy. As emperors of the Holy Roman Empire, Habsburg Austria was expected to defend and promote Catholicism.

The Protestant Reformation in the 16th century threatened Catholic Habsburg rule within the Holy Roman Empire. This conflict was temporarily resolved in 1555 by the Peace of Augsburg, which divided the empire into Catholic and Protestant dominions. However, the continued expansion of Protestantism eventually undermined this treaty. Combined with disputes over the limits of imperial authority, French-Austrian rivalry, and the Dutch and Bohemian revolts, these tensions culminated in the Thirty Years’ War.

In our timeline, the Habsburgs did not win this war. France, Sweden, and Brandenburg-Prussia expanded their territories; Switzerland and the Netherlands left the Holy Roman Empire; and Austria’s influence was greatly reduced. But what if the peace settlements had been even harsher on Austria?

Although the Ottomans were not directly involved in the war, they indirectly contributed through anti-Habsburg forces in Hungary led by Gabriel Bethlen. Let’s imagine a scenario where the Ottomans gained full control of Hungary, including Slovakia, and took cities such as Győr, Maribor, Zagreb, and Miskolc. Suppose the Bohemians succeeded in their rebellion, establishing modern-day Czechia as an independent state. For Brandenburg-Prussia, they could have gained the Silesian region—one of the most industrialized areas of the Austrian Empire—much earlier than they did in 1740. The Dutch could have secured all of the Lowlands, including Belgium, Luxembourg, and Lille.

All these changes would have left Austria far weaker, stripped of its most productive regions. This alternate outcome would have allowed Brandenburg-Prussia to become the dominant military and political power in the German world, potentially leading to the collapse of the Holy Roman Empire long before the Napoleonic era.

The Rise of Napoleon (1800)

Following the French Revolution, France had completely dethroned the Bourbon dynasty, spreading revolutionary and liberal ideals across Europe. These ideals further strained relations with the Habsburgs, who still ruled over many of Europe’s most significant kingdoms.

When the War of the First Coalition began, France advanced into the Lowlands and the Rhineland, establishing “sister republics” based on revolutionary principles—such as the Batavian Republic in the Netherlands. In 1797, Austria was defeated and forced out of the First Coalition.

After Napoleon Bonaparte rose to power in 1799, he extended revolutionary influence into Piedmont, Rome, and other Italian kingdoms, igniting the War of the Second Coalition in 1802. This war ended once again in a French victory, leaving France with several client states in northern Italy—territories that once belonged to the Habsburgs.

The Third Coalition War is where we focus. In our timeline, after the French victory at Austerlitz (1805), Napoleon occupied parts of Tyrol and Dalmatia from Austria. But in a harsher alternate outcome, imagine that Austerlitz had been a total disaster for Austria—Napoleon could have gone further, establishing sister republics within Austria itself. These could include the Republic of Hungary, the Republic of Bohemia, and the Republic of Galicia-Lodomeria.

Such changes would have reduced Austria to a small core territory (modern-day Austria and Slovenia) and turned it into a French client state, effectively deposing the Habsburgs and transforming their realm into another French-aligned republic.

From there, Austria’s future would be uncertain. If Napoleon had allowed these sister republics to operate independently rather than as puppet states, they might have evolved into stable, non-expansionist republics—similar to the modern European states we know today. The Habsburg dynasty, having lost its main domain, would have faded into obscurity, reduced to a noble family with little political influence, not only in Austria but across Europe. Such an outcome would have made any Austrian restoration of their former empire impossible.

World War I

In our timeline, the Austrian Empire was already struggling by the 19th century. After the Hungarian Revolution, it was forced to grant maximum autonomy to Hungary, becoming the Austro-Hungarian Empire in 1867. The Habsburgs could no longer control their many ethnic minorities.

By the time World War I began, the empire was fragile. Nearly half of its army did not speak German, causing major communication problems between divisions. After losing the war, Austria-Hungary was dissolved, giving rise to Czechoslovakia, Hungary, Yugoslavia, and Poland as independent nations. The Habsburg dynasty was formally abolished, and the Habsburgergesetz (“Habsburg Law”) banned the family from political power in Austria.

But what if the postwar treaties had been even harsher?

In this alternate vision, Hungary might have sought full independence before World War I and joined the Entente Powers, receiving guarantees of sovereignty and territorial integrity from Britain, France, and Russia. This shift would have made an Austrian victory completely impossible. Following defeat, Austria could have lost Burgenland, South Tyrol, Slovenia, Croatia, Bosnia, Galicia, and Bohemia in the peace treaties.

The Habsburg monarchy would still have been abolished, but this time under even stricter Allied terms. France and the United Kingdom might have imposed a democratic government in Vienna modeled after their own systems, ending Austrian imperialism and expansionism forever.

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