The Judaism was the cultural trait that kept the Jews unified, unique, and to hold strong for their common interests.
Explanation:
The Jews are one of the most, if not the most tormented people across the human history. Multiple times they have been enslaved and conquered, and on multiple occasions they have been persecuted from their homeland, always making a big blow on the population and its preservation. The Jews though managed to preserve their culture and their identity throughout thousands of years and still do, and the main factor in it was their religion.
The Judaism was a religion that was practiced locally, only by one group of people. It was separating the Jews from the other people, which caused them huge problems more often than not, but it also made them unified and strong. The Jews saw their religion as something that can keep their identity and culture alive, so they always stuck to it, cherished it, and used it for maintaining relations and collaboration between each other in foreign lands.
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