If Israel is the Jewish promised land, why don’t all Jews live there?

I don't get it.. If they say the now so called israel is their promised land and that only them should live there , why are they still living in other places in the world? If they say they have suffered a lot and payed a lot to have their own jewish state , why do they leave it?

If Israel is the Jewish promised land, why don’t all Jews live there?
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