The Cossack Hetmanate emerged in central Ukraine in the 17th century but was partitioned between Russia and Poland before being absorbed by the Russian Empire in the late 19th century. Ukrainian nationalism developed and, following the Russian Revolution in 1917, the short-lived Ukrainian People's Republic was formed. The Bolsheviks consolidated control over much of the former empire and established the Ukrainian Soviet Socialist Republic, which became a constituent republic of the Soviet Union in 1922. In the early 1930s, millions of Ukrainians died in the Holodomor, a human-made famine. During World War II, Ukraine was occupied by Germany and endured major battles and atrocities, resulting in 7 million civilians killed, including most Ukrainian Jews.