(185270) Period in France under the rule of Emperor Napoleon III (the original empire having been that of Napoleon ).
In its early years (185259), the empire was authoritarian but enjoyed economic growth and pursued a favourable foreign policy. Liberal reforms were gradually introduced after 1859, but measures such as a low-tariff treaty with Britain alienated French businessmen, and political liberalization led to increased opposition to the government. In 1870 a new constitution establishing a quasi-parliamentary regime was widely approved, but France's defeat at the Battle of Sedan in the Franco-Prussian War was followed by an uprising in Paris on Sept. 4, 1870. This resulted in the overthrow of the government, the abdication of Napoleon III, and the end of the Second Empire.