What period is called modern history?

The period of modern history is called the period from 1917, from the October revolution, when the tsarist power was destroyed and the people came to power, so to speak, the emergence of a new political system, the destruction of capitalism and the emergence of socialism, the emergence of a single party of the CPSU, an attempt to equalize people among themselves, the struggle of two the strongest states of the USSR and the USA, etc.