Second, the Persians saw communication as a key to unifying, and thus controlling, their realm. They promulgated a coherent set of tax laws and issued a single currency for their realm, currency being the medium of communication in business. They built a tremendous network of roads and studded it with hostels to make travel easy. They developed an efficient postal system, too, an early version of the Pony Express. That quote you sometimes see associated with the U.S. Postal Service, “Neither snow nor rain nor heat nor gloom of night stays these couriers from the swift completion of their
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