The twelfth, final volume of the work "History of the Second World War 1939-1945" is devoted to the results of the war and its lessons. It summarizes the most important socio-political, economic and military results, examines the impact of the victory of the Soviet Union and other countries of the anti-Hitler coalition on post-war events in the world. In the first part of the volume - "Social and Political Results of the War" - the socio-political conditions and factors of victory over fascism, the historical mission of socialism in achieving victory, the vanguard role of the Communist Party of the Soviet Union in the fight against fascism are considered. The article analyzes the struggle of the masses, the resistance movement and the anti-fascist underground, the contribution to the overall victory over the enemy of the United States, England, France and other countries. The experience of political and military cooperation of states with different social systems within the framework of the anti-Hitler coalition ; is summarized. The collapse of the political systems and ideology of fascism and militarism The second part - "Economic results of the war" - summarizes the results of the economic confrontation of the states participating in the war , The decisive contribution of the Soviet economy to the achievement of victory , The superiority of the economic system of socialism over the capitalist system is revealed , Problems of Economic Support of War by the Bourgeois Countries of the Anti-Hitler Coalition , as well as the militaristic nature of the economies of Germany and Japan and the reasons for the economic defeat of these countries The third part - "Armed Forces and Military Art in the Second World War" - is devoted to the analysis of the armed forces of the states participating in the war, armed struggle and military art. It reveals the characteristics of the armed struggle in the theaters of war , prerequisites and conditions for the implementation of a radical change on the Soviet-German front - the main front of the Second World War , Strategic Initiatives , for military-technical superiority and other problems. Particular attention is paid to the coverage of the undeniable superiority of the military organization of the USSR, Soviet military art over the military organization and military art of the enemy , Features of the military organization of the bourgeois countries of the anti-Hitler coalition are shown , as well as the bankruptcy of the military doctrines and military art of the states of the fascist bloc. The fourth part - "The World After the War" - explores the main problems of the postwar years. The impact of the results of the war on changing the balance of power on the world stage in favor of socialism , transformation of the world socialist system into a decisive factor of historical development, The importance of the victory over fascism for the world revolutionary process , to address the fundamental socio-economic and political challenges of modernity ; The active character of the struggle of the Soviet Union is revealed , CPSU, other countries of the socialist commonwealth and fraternal parties , all the progressive forces of the world for the consolidation of the results of the Second World War , the solution of the central problem of modernity - the prevention of a new world war , further strengthening of peace and security of peoples. The conclusion provides an analysis of the results and lessons of the Second World War and their connection with modernity, emphasizes that the world-historical victory over fascism serves as a formidable reminder to all those who do not take into account the lessons of history.