Well, one thing is that it resulted in the Treaty of Versailles being forced upon Germany, which in the long term was the main cause of the rise of Nazism (thus Hitler) in Germany and Fascism in Italy. Another major impact was the Bolshevik Revolution in Russia. Lenin took advantage of the dissatisfaction of the people with WW 1 and grabbed the opportunity to establish the world's first communist state. The workers conditions were improved and communists all over the world had an example to follow. To prevent similar uprisings in their own countries, Western Capitalist governments had to introduce ameliorative measures for laborers like Minimum-wage laws, strict working hours, equal pay for equal work and the concept of social security.
