Poland allowed in many groups to mass settle Poland following the Mongol invasions, not just Jews, but also Germans, Scots, Armenians, Tatars, and others.
This has nothing to do with the topic, you have to look into treatment of Jews in Poland 1935 to 1939. Which doesn't mean that is to be blamed for the Holocaust, but certain points that should be raised.
Sure, Poland in the mid - late 1930's restricted Jews from holding many positions of power.
However, can you blame them?
Things like this prove them correct in their resentment of Jews.
Jewish Poznań | Poznan
between Jews and Germans strengthened. In fact, so solid were these relations that the Jewish community rallied around the Germans during the
1918-1919 Wielkopolska Uprising, a fact not forgotten by the local Poles. When Poznań was absorbed into the Polish nation in 1919 the Jews found themselves once more on the hard end of local feelings, and a significant number migrated west to Germany, where they expected greater tolerance.
YIVO | Bund
When the first city council elections were held in Poland in 1919, some voices in the Bund called for the organization not to participate. Those urging a boycott maintained that a revolutionary movement should not play a political game in which terms were dictated by reactionary bourgeois and nationalist elements that dominated the political life of the young Polish state. Most branches of the Bund, however, decided to field candidates; indeed, 160 Bund representatives were chosen for various municipal councils. In Warsaw and
Łódź, the Bund attracted more than 20 percent of Jewish voters,