Task: Text Categorization
Input (English): During this war, the Meteor gunboat was engaged in a prearranged, indecisive duel outside Havana Harbor. One new national holiday celebrating a battle in this war was set for 2 September. The losing side's army was forced westwards in the Battles of Spicheren and Worth, but were prevented from going further by the Battle of Mars-la-Tour, which was lost by Marshal (*) Bazaine, who also lost the subsequent Battle of Gravelotte, which trapped him in Metz. The withdrawal of a Roman garrison by the losing side in this war let Italy complete the Risorgimento. In this war, Leon Gambetta escaped his capital in a hot air balloon to organize resistance. A government change occurred in this war after the defeat at Sedan. For 10 points, name this 1870-1871  war that resulted in the formation of the Second German Empire, which took Alsace-Lorraine from its defeated opponent.
Output (English): History