In the years following unification, German society was radically changed by numerous processes, including industrialization, rationalization, secularization and the rise of capitalism. German power increased considerably and numerous overseas colonies were established. During this time, the German population grew considerably, and many emigrated to other countries (mainly North America), contributing to the growth of the German diaspora. Competition for colonies between the Great Powers contributed to the outbreak of World War I, in which the German, Austro-Hungarian and Ottoman Empires formed an the Central Powers, an alliance that was ultimately defeated, with none of the empires comprising it surviving the aftermath of the war. Under the terms of the Treaty of Versailles, the German and Austro-Hungarian Empires were both dissolved and partitioned, resulting in millions of Germans becoming ethnic minorities in other countries. The monarchichal rulers of the German states, including the German emperor Wilhelm II, were overthrown in the November Revolution which led to the establishment of the Weimar Republic. The Germans of the Austrian side of the Dual Monarchy proclaimed the Republic of German-Austria, and sought to be incorporated into the German state, but this was forbidden by the Treaty of Versailles and Treaty of Saint-Germain.