Short answers, pulled from the story.
Adolf Hitler issued a decree that annexed western Polish areas and the Free City of Danzig directly into Germany on the 8th of October 1939. This legal act created new administrative units called Reichsgaue Wartheland and Danzig-West Prussia.
A total of about 780,000 ethnic Poles lost their homes between 1939 and 1944 within these areas. At least 250,000 were deported to the General Government region while another 310,000 were displaced or forced into Polenlager camps inside the respective Gaue.
In Warthegau where most Germans were settled the share of the German population increased from 6.6% in 1939 to 21.2% in 1943. Arthur Greiser welcomed the millionth Volksdeutscher resettled during Heim ins Reich action in March 1944.
The population rose from roughly 60,000 to 140,721 in Łódź while the German population grew from about 6,000 in 1939 to 93,589 by 1944 in Poznań. A small Dutch artisan colony was already established in Poznań by 1941.
Out of 2,500 Catholic priests in Warthegau 752 perished and one-third survived the war in prisons and concentration camps. In Poznań out of 800 Catholic Polish priests in 1939 only 34 remained alive by 1943.