 Complete the following phrase:  Before it took place on 20 March 1921, two Silesian uprisings had been organised and instigated by Polish inhabitants of the area. Poland won 41 of the votes in the plebiscite, and a plan for the division of Upper Silesa was then made.that led to a new phase of the Silesian Uprisings, the so-called Third Silesian Uprising and the 