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How did the conquest of Algeria help Marseille expand as a port?

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View of the old port of Marseille, France, with numerous boats docked in the harbor and the city's terracotta-roofed buildings rising up a hill, topped by the Notre-Dame de la Garde basilica. — Marseille Seaside view of the Old Port of Marseille, France.

The conquest of Algeria in 1830 was a pivotal factor in the development of Marseille as a major maritime hub during the second half of the 19th century. By serving as the primary gateway for French colonial expansion, the city earned the title of the "port of empire."1

This era of growth was further bolstered by the elimination of Barbary pirates between 1815 and 1835, which made Mediterranean trade routes significantly safer and more reliable. The increased maritime activity necessitated substantial infrastructure improvements, leading to the construction of grand avenues, monuments, and the Bourse, which housed the Chamber of Commerce. Additionally, the city addressed its growing needs by completing a major project to bring water from the Durance River to support its expanding population and port operations.1