Who were the Persians and what was there relationship towards Greece

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Explanation:

Greco-Persian Wars, also called Persian Wars, (492–449 bce), a series of wars fought by Greek states and Persia over a period of almost half a century. The fighting was most intense during two invasions that Persia launched against mainland Greece between 490 and 479.

porter is writing economic history because he is focusing on the cost of developing vaccines.