Ashoka was following the directions of the Buddha who, prior to his death directed that stupas should be erected in places.
Ashoka's goal was not to expound on the truths of Buddhism but to inform the people of his reforms and encourage them to live moral lives. The order, through their strategic placing and couched in the Buddhist dharma, obey to underscore Ashoka's administrative role as a liberal leader. Tending to terrene needs. In addition to his edicts, Ashoka made stupas, monasteries, and different religious structures at noteworthy Buddhist sites, such as Sarnath. Among his works of public use were the founding of hospitals for people and animals, the planting of roadside trees and groves, the till of wells, and the erection of watering sheds and rest houses.
So we can conclude that Ashoka's services to Buddhism. He built a number of stupas (commemorative burial mounds) and monasteries and erected pillars.
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