What were Bismarck’s main foreign-policy goals after German unification?

After the unification of Germany in 1871, Otto von Bismarck’s primary foreign-policy goal was to maintain peace and security to ensure the newly formed German Empire was accepted as a stable, "satiated" power rather than an interloper in Europe.12

His key objectives included:

• Preventing Anti-German Coalitions: Bismarck’s most critical aim was to isolate France diplomatically to prevent a war of revenge. He worked to ensure France could not form an alliance with Russia or Austria-Hungary, which would have created a dangerous two-front threat for Germany.12
• Managing Balkan Tensions: He sought to prevent a general European conflict sparked by the decline of the Ottoman Empire. By acting as an "honest broker" at the Congress of Berlin in 1878, he aimed to mediate disputes between Russia and Austria-Hungary.13
• Diplomatic Balancing: Bismarck utilized complex alliances, such as the Three Emperors’ League and the Reinsurance Treaty, to maintain influence in both Vienna and St. Petersburg, effectively balancing the competing interests of his neighbors to avert war.12

Bismarck generally opposed overseas colonial expansion, viewing it as an unnecessary risk, though he occasionally pursued it to divert domestic nationalism or to create friction between other powers.2