Until what year was Boulogne-Billancourt known as Boulogne-sur-Seine?
1924
1935
1915
1940
Answer
The change occurred in 1924 to avoid confusion with the nearby city of Boulogne-sur-Mer. The addition of "-Billancourt" differentiates the two cities, recognizing Billancourt as an integral part of the municipality's identity.
Boulogne-Billancourt: Trivia Expedition in the Heart of Île-de-France!
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