Until World War II the language spoken by different classes and professions of Warsaw evolved independently, although were eventually mixed and interlinked. After the Warsaw Uprising, when the majority of its speakers were either killed or expelled and resettled in other parts of the world, the dialect became separated from its geographical roots and its users dispersed. After the war only a small number of pre-war Varsavians returned there while the vast majority of the inhabitants of the city came from other parts of Poland. Because of that, the language spoken in Warsaw became heavily influenced by other dialects of the Polish language. The only boroughs of Warsaw where the dialect was preserved to some extent were Praga and Wola.