Why did Cologne prosper after becoming part of Prussia in 1815?

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Following its transition to Prussia in 1815, Cologne entered a new era of prosperity driven by several key factors:

  • Industrial Growth: A wide range of industries flourished within the city, supported by the establishment of a chamber of commerce, which was the first of its kind in Germany.
  • Strategic Transportation: Cologne’s geographic location made it an ideal hub for the developing railway network, significantly enhancing its connectivity and economic reach.
  • Economic Integration: The broader regional economy benefited from the Congress of Vienna in 1815, which established the principle of free navigation on the Rhine River. This policy, later reinforced by the Mainz Convention of 1831, removed political restrictions on river trade, allowing Cologne to leverage its position as a major commercial artery.12

These developments fueled rapid urbanization, with the city's population increasing nearly ninefold over the course of the 19th century.1