Phoenicia's greatest legacy to the world is to develop the alphabet in order to create a writing system that use symbols to represent sounds for the Phoenicians.
The answer is a superordinate goal. This is something that is sufficiently enormous and sufficiently convincing to help people and gatherings disregard individual contrasts keeping in mind the end goal to accomplish something altogether past their present achieve, something that can't be secretly held by any of the individuals, and is rather nearer in nature to a Commons.