Kiev prospered again during the Russian industrial revolution in the late 19th century. In the turbulent period following the Russian Revolution the city, caught in the middle of several conflicts, quickly went through becoming the capital of several short-lived Ukrainian states. From 1921 the city was part of the Soviet Union, since 1934 as a capital of Soviet Ukraine. In World War II, the city was destroyed again, almost completely, but quickly recovered in the post-war years becoming the third most important city of the Soviet Union, the capital of the second most populous Soviet republic. It now remains the capital of Ukraine, independent since 1991 following the dissolution of the Soviet Union.