One of the regions that demonstrated its Polish identity was the ethnic Silesian minority in Upper Silesia, which was subjected to systematic Germanisation and conversion to Protestantism under the German Empire. After the Polish nation state was founded in 1918, Germany's Regency of Oppeln (Upper Silesia) rebelled in solidarity with the Second Polish Republic in what became known as the Silesian uprisings. An eastern sliver of the region became part of the Polish Republic in 1922, and the Polish government had decided to grant the German territory autonomy in 1919 with the Silesian Parliament as a legislative and the Silesian Voivodeship Council as the executive body.