How was Poland affected by the Treaty of Versailles?

The newly created State of Poland got back all the territories she had lost in the War. Posen and almost the whole of West Prussia were also included in the Polish State. To provide Poland with a port, the German city of Danzig was internationalised. It was kept as a 'Free City' and placed under the protection of League of Nations. Trading rights through the City of Danzig increased Poland's wealth and resources.