The city was founded on 4 February 1221 by Prince Yuri II of Vladimir. In 1612, Kuzma Minin and Prince Dmitry Pozharsky organized an army for the liberation of Moscow from the Poles. In 1817, Nizhny Novgorod became a great trade center of the Russian Empire. In 1896, at a fair, an All-Russia Exhibition was organized. During the Soviet period, the city turned into an important industrial center. In particular, the Gorky Automobile Plant was constructed in this period. Then the city was given the nickname "Russian Detroit". During World War II, Gorky became the biggest provider of military equipment to the Eastern Front. Due to this, the Luftwaffe constantly bombed the city from the air. The majority of the German bombs fell in the area of the Gorky Automobile Plant. Although almost all the production sites of the plant were completely destroyed, the citizens of Gorky reconstructed the factory after 100 days. After the war, Gorky became a closed city and remained one until after the dissolution of the Soviet Union in 1991. At that time, the city was renamed Nizhny Novgorod once again. In 1985, the Nizhny Novgorod Metro was opened. In 2016, Vladimir Putin opened the new 70th Anniversary of Victory Plant which is part of the Almaz-Antey Air and Space Defence Corporation.