On 2 May 1857,
Emperor Napoleon III signed an
imperial decree declaring that Arcachon was now an
autonomous municipality; coincidentally, the railway line extension from
Bordeaux to Arcachon had been completed that same year. At that time, Arcachon was scarcely more than a forest of pine trees, oaks and strawberry trees (
arbutus), with no road links and few real houses and a population fewer than 400 people, mostly fishermen and peasants. In earlier years, when some hygienists began to recommend sea bathing, three sea establishments were laid out by investors to attract the Bordeaux bourgeoisie and other wealthy people. Until 1950, tuberculosis patients also visited Arcachon for fresh-air treatments. Arcachon is known for the "Arcachonnaise", the local name for an
Arcachon villa, the architectural style of many of the older houses built there in the nineteenth century. The
United States Navy established a
naval air station in the area on 8 June 1918 to operate
seaplanes during World War I. The base closed shortly after the
First Armistice at Compiègne. ==Population==