In the collective work, some results of the completed century are summed up, which will go down in history both with its huge achievements and successes, and with tragedies and contradictions. The work highlights the clash of democracy and totalitarianism, the impact on the fate of mankind of the two world wars, the role of socio-political changes, the place in the history of the XX century. religious factor, as well as other features of this tumultuous century. A special section is devoted to the development of the main regions of the world - Europe, East, Africa and Latin America; separately consider the results of the century for Russia and the United States For historians, political scientists and a wide range of readers .