They had no say on the borders, but they certainly had a say in the ethnic cleansing that followed.
Let’s talk “Ethnic Cleansing” shall we....
It is estimated that between 1.6 and 2 million people were expelled from their homes during the German occupation of Poland. The Nazi German organized expulsions—by themselves—affected 1,710,000 Poles directly. New estimates by Polish historians give the number of 2.478 million people expelled. Additionally, 2.5 to 3 million Poles were taken from Poland to Germany as slave labourers to support the Nazi war effort. These numbers do not include people arrested by the Germans and sent to Nazi concentration camps.
Paybacks are a bitch!