Reduced barriers to trade resulted in mutual prosperity, which fostered economic interdependence, kinship ties between merchant families, and deeper political integration these factors solidified the League into a cohesive political organization by the end of the 13th century. Hanseatic cities gradually developed a common legal system governing their merchants and goods, even operating their own armies for mutual defense and aid. These arrangements gradually coalesced into the Hanseatic League, whose traders enjoyed duty-free treatment, protection, and diplomatic privileges in affiliated communities and their trade routes. The League originated from various loose associations of German traders and towns formed to advance mutual commercial interests, such as protection against piracy and banditry. Growing from a few north German towns in the late 12th century, the League ultimately encompassed nearly 200 settlements across seven modern-day countries at its height between the 13th and 15th centuries, it stretched from the Netherlands in the west to Russia in the east, and from Estonia in the north to Kraków, Poland in the south.

The Hanseatic League ( / ˌ h æ n s i ˈ æ t ɪ k/ Middle Low German: Hanse, Düdesche Hanse, Hansa Modern German: Deutsche Hanse Dutch: De Hanze Latin: Hansa Teutonica) was a medieval commercial and defensive confederation of merchant guilds and market towns in central and northern Europe.

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