The nationwide struggle against the Nazi invaders.

The USSR did not prepare for war on its territory, this can explain the fact that in the first months of the war there was practically no resistance against the fascist conquerors. But after a while, the country launched a counteroffensive. This happened due to the fact that all segments of the population were mobilized. The production of military equipment and weapons was increased. And the main thing is that the population itself tried to provide a struggle against the conquerors as much as possible. Therefore, the victory can really be considered nationwide, because the contribution was from almost every person.