How did the safavid empire reach its pinnacle under shah abbas?

Under Shah Abbas´ rule (1588-1629), the Safavids reached their pinnacle, but after his demise, the empire´s power decayed.

Explanation:

Shah Abbas created a system to train administrators to manage the kingdom. He further developed his army, providing it with the most advanced weapons at the time. He confronted the Ottomans to regain lost territories y obtained a peace treaty that returned Azerbaijan to the Safavids.  

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