From what I remember many Ukrainians sided with the Nazis, in their genocide as well as fighting the Red Army.
And France had many collaborators. Btw, the Poles under the Vatican aren't nearly as anti-Semitic as the proud west likes to portray them either. For one thing, Poland is the only country in Europe which never expelled the Jews from its realm.
Much of Western Europe did and not just in the occupied countries. The UK and the US both had visible Nazi parties at least before the war.
That said, Antisemitism had roots that ran deep in Eastern Europe well before the Second World War. The Tsarist pogroms into Jewish areas such as the Pale are an example. Meanwhile such actions had ceased for a long time in Western Europe.
Poland the 'only' country? I find that a little hard to believe. Please show me where the Netherlands, France, Italy, Greece, and Scandinavian countries all banned Jews. On the contrary I remember Reformation era Netherlands allowing Iberian Jews to settle there (prior to the Reformation the Netherlands had not existed for all intents and purposes).
Lastly, and not that it is ultimately that important to the subject at hand, the era of the KKK that you cited was more xenophobic than racist. Jews and Catholics were seen as a greater threat than blacks were.
King Christian V (House of Oldenburg) did indeed rescind privileges and dispensation given under his predecessor Christian IV to the Sephardim and later the Askhenazi, in 1687 and banned Jews to Norway. Also, under the first Norwegian constitution of 1814 (when it was still part of the Kingdom of Denmark, later to enter into 'personal union' with the Swedish monarchy), there was a paragraph which banned both Jesuits and Jews, though I believe it was repealed in 1852 or so only to be re-instated briefly by Vidkun Quisling during the Nazi occupation of Norway.