There is also some historical background why the national dishes in certain countries in Eastern Europe are mainly pig-based. During the religious wars from the 11th century between the Christians and the Muslims there was a lot of back and forth in terms of region control. Since the Muslims didn't eat pork all the christian regions converted to mainly eating pork since the Muslims had no use for the pigs.
I see. That is interesting. From what I understand, there are a few sects of Christianity which forbid eating porks. I'm not sure which is it.