The story of "earth recovered"

Zdjęcie: O polskie słupy graniczne na Odrze! - plakat propagandowy z okresu PRL dot. tzw. Ziem Odzyskanych Źródło: Wikimedia Commons


The Ministry of Recovered Lands was established to accelerate the integration of lands lying in the west of Poland with the remainder of the country. How much was it propaganda, how much was it necessary? How was the request to belong to Poland?