After all, there were 3 Uprisings against Germans in Silesia.
The uprisings where a tool by Warsaw to get more of the cake they already got with the help of the Treaty of Versailles.
After all Silesia was the richest region, most industrial developed with rich coal fields...
The League of Nations organized a plebiscite to decide the issue in 1921, whose results (disputed by Poland) were skewed by the German population and therefore wished to remain part of Germany.
"Skewed by the German population" my arse! Yeah....they voted overwhelmingly for staying in Germany...:)
But there really was a difference between upper and lower Silesia...upper Silesia more polish and lower Silesia being nearly totally German.
The most discussed of these three plebiscites in the German East was the one in Upper Silesia, since the region was one of Germany's principal industrial centers.
The most important economic asset was the enormous coal-mining industry and its ancillary businesses, but the area yielded iron, zinc, and lead as well.