2. As for Bulgaria...not deporting Jews to their death for one small period of time != lack of antisemitism in the past few hundred years.
According to the USHMM,[1] Bulgaria's actions in World War Two included:
Instituting laws that, among other things, forbid Jews from marrying non-Jews and restricted where Jews could live and what jobs they could have.
Deporting Jews who were not in Bulgaria pre-war (its borders expanded) to their deaths.
Sending Jews to slave labor camps. [1]https://encyclopedia.ushmm.org/content/en/article/bulgaria
So, no, Bulgaria was antisemitic in the past few hundred years.
Most of the examples of antisemitic repression in Poland took place during the post-partition era in the 19th century, when Poland was ruled by Russia, and Poles themselves faced similar repression by the Russian authorities.
Russians were more aligned with usa tho...