Electorate
In the period 1897-1919, when voting rights were restricted the party mainly received support from educated workers and young members of the Intelligentsia (lawyers, teacher, vicars and engineers). The SDAP was mainly supported by atheists and latitudinarian protestants. When universal suffrage was granted in 1919 the SDAP began to expand to all layers of the population, drawing heavy support from the working class.
The party historically received strong support from the major cities, such as Amsterdam and Rotterdam, and the northern provinces of Groningen, Friesland and Drenthe and the industrial region Twente.
Read more about this topic: Social Democratic Workers' Party (Netherlands)