Original sentence: Upper Silesia plebiscite was a plebiscite for self-determination of Upper Silesia required by one of the clauses of the Treaty of Versailles
Edited sentence: 11.1920, addressed to Your Eminence and to the Prince-Bishopric of Breslau (now Wroclaw).Massive influx of outsider Catholic Polish clergy, many even from America, came into Upper Silesia to ensure votes for Poland.The pastor Josef Kubis wrote for help in a Bittschrift he wrote at Oppeln on 4.Upper Silesia plebiscite was a plebiscite for self-determination of Upper Silesia demanded by one of the clauses of the Treaty of Versailles