(JNS) Diaspora Jews have a collective history of constant migration. Ethnically cleansed hundreds of years ago from their ancient homeland in Israel, they wandered between continents that periodically persecuted them, threw them out or barred them altogether.

How, then, should Jews approach today’s phenomenon of the mass migration of peoples?

All over the world, millions are on the move from the impoverished and violent developing world to the West in search of a better and safer life.

On America’s border with Mexico, tens of thousands are trying to cross into the United States in order...