Why did Germany form a Dual Alliance with Austria-Hungary?

To Counter the Rise of Russia: Russia's expanding influence and military strength concerned both Germany and Austria-Hungary. By forming an alliance, they aimed to balance the power dynamics in Europe and protect their collective interests against potential Russian aggression.

Mutual Defense Concerns: The Dual Alliance ensured that if either Germany or Austria-Hungary faced attack by another power (excluding France), the other would come to its aid militarily. This arrangement provided both countries with increased security against potential enemies.

Territorial and Political Interests: The alliance addressed specific territorial and political interests shared by Germany and Austria-Hungary. For example, Austria-Hungary was concerned about Russian advances in the Balkans while Germany sought to maintain regional hegemony and prevent potential French military dominance.

Diplomatic Isolation of France: Germany formed the Dual Alliance partly to diplomatically isolate France. After France's defeat in the Franco-Prussian War (1870-1871), Germany aimed to keep France contained and avoid the risk of renewed hostilities.

Realpolitik and Balance of Power: The concept of Realpolitik—pragmatic and realistic foreign policy based on national interests—influenced Germany's decision to forge the Dual Alliance. By securing an alliance with Austria-Hungary, Germany strengthened its overall strategic position in Europe.

Influence in Central and Eastern Europe: The alliance consolidated German influence in Central and Eastern Europe, granting them greater sway in regional affairs and potentially influencing neighboring countries like Italy and Romania.

These factors collectively led Germany to form the Dual Alliance with Austria-Hungary, setting the stage for the intricate network of alliances and tensions that played a significant role in the buildup to World War I.