The question of who made the main contribution to the Victory began to be discussed even before the end of World War II. Both the West and the USSR stubbornly pulled the blanket over themselves, reinforcing the thesis of their leading role in the defeat of Nazism both in historical science and in the public consciousness. After the collapse of the Soviet Union, historical battles unfolded with renewed vigor. There are still ongoing debates about whether Stalin was an ally of Hitler, who is to blame for starting the war, whether the USSR could independently defeat the Third Reich, what guided the British and Americans when they delayed the opening of the Second Front, whose contribution to the Victory was more significant and who First of all, he took advantage of its fruits, winning in the post-war world. This book very clearly and convincingly answers the most controversial questions on the history of the Second World War, including who ultimately made a decisive contribution to the defeat of the Third Reich.