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Second French Empire.
Second French Empire was created in 1852.
Actually, there were two French Empires.
The First French Empire of Napoleon I and II (1804-1814 and 1815)
The Second French Empire of Napoleon III (1852-1870)
The second French Republic was established after the 1848 revolution (the French had more than one revolution). The nephew of Napoléon Bonaparte (the first emperor) was elected as president, but turned the Republic into a second empire on Dec 2, 1852. He chose that date because that was the anniversary of the battle of Austerlitz.
The rule of Emperor Napoleon III was called the SECOND FRENCH EMPIRE.