The Jews are no different. With people ostracizing them, if not outright persecuting them, what choice did they have but to band together, and watch each other's backs? If you hunt people like dogs, then they are going to form a pack, or die alone.
Jews were not hunted like dogs in Poland - they were disliked by many, sure - I read that if you read through criminalistic data from the interbellum period the offences against Jews were no higher than any other offences - and I think Jews did act out their main religious belief that they were the chosen nation
It's true. People are just cliquey. Jews and Poles are just another example of cliquey people. Welcome to reality!
yeah, sure - give me the examples of Polish cliques that run things in America on whatever level