Over the centuries the ownership of the town changed frequently, as did the borders between different countries. After the foundation of the German Empire in 1871 the area became known as "Dreikaisereck" ("triangle of the three emperors"), as it was situated at the point where the Austrian, German and Russian Empires adjoined. After World War I, in 1918, Poland regained independence, and in 1919, local Polish miners organized large protests in Mysłowice. On August 15, 1919, the German "Grenzschutz" opened fire on protesting Polish miners and their families. Seven miners, two women and a teenage boy were killed, and many people were wounded. The event, known as the "Mysłowice massacre", sparked the First Silesian Uprising against Germany. In 1921, the Upper Silesia plebiscite was held, in which 56% of the residents of Myslowitz voted to remain in Germany and 44% voted to rejoin Poland, while the overwhelming majority in the present-day districts (then surrounding villages) of Brzezinka, Brzęczkowice, Dziećkowice, Kosztowy, Krasowy and Wesoła opted to reintegrate with Poland, with the result ranging from 77.3% voting for Poland in Brzęczkowice to 96.7% in Wesoła. After the Silesian Uprisings in 1922, Mysłowice and the rest of East Upper Silesia became part of the newly restored Second Polish Republic.