Why was the second world war considered a continuation of the first? Why did the colossal building of the Russian

Why was the second world war considered a continuation of the first? Why did the colossal building of the Russian empire collapse in early February 1917 in just a few days of peaceful demonstrations?

The victory of the Entente countries and their allies in the First World War did not resolve all existing contradictions. On the contrary, the terms of the peace treaty concluded between the victorious powers and the defeated Germany put the latter in a humiliating position and laid the foundations for a new international conflict. The German state, having lost a huge part of its territories, was experiencing a severe economic crisis. Therefore, it became possible for the Nazis to come to power, who advocated a revision of the results of the previous war.