After The Russian Revolution of 1917, on January 20, 1921 Chechnya and Ingushetia joined the Soviet Mountain Republic. On November 30, 1922 the Chechen Autonomous Oblast of RSFSR was separated. On July 7, 1924 the Ingush Autonomous Oblast of RSFSR was separated. On January 15, 1944 they were joined into the Chechen-Ingush Autonomous Oblast of RSFSR, which was reorganized into Chechen-Ingush ASSR of RSFSR on December 5, 1936.
During the World War II, in 1942-1943 the republic was partly occupied by Nazi Germany while 40,000 Chechens fought in the Red Army. In 1944, on the orders by Joseph Stalin, the republic was disbanded and the population forcibly deported upon the accusations of collaboration with the invaders and separatism.
The republic was restored in 1957 by Nikita Khrushchev.
In November 1990, the republic issued the declaration of its sovereignty and in May 1991 an independent Chechen-Ingush Republic was pronounced, which was subsequently divided into independent Chechen Republic and Republic of Ingushetia.