With an area of 5,000,000 km2, the Maura Empire was one of the world’s Largest empires in its time, and the largest ever in the South Asia. Modern-day Pakistan was conquered by Chandragupta maurya, who overthrew the powerful Nanda Dynasty of Magadha and established the Maurya Empire: He conquered the trans-Indus region to the west, which was under Macedonian rule – annexing Baluchistan and much of what is now Afghanishtan, including the modern Herat and Kandhar provinces – and then defeated the invasion led by Seleucus 1, a Greek general from Alexander’s army. Seleucus is said to have reached a PEACE TREATY with Chandragupta by giving him control of the territory south of the Hindu Kush upon intermarriage as well as 500 elephants.
Alexander took these away from the Indo-Aryans and established settlements of his own, but Selecus gave them to Sandrocottos (Chandragupta), upon terms of intermarriage and of receiving in exchange 500 elephants.
Strabo, 64 BC–24 AD:
Emperors Chandragupta and Bindusara expanded the Empire into India’s central and southern areas, while Ashoka pushed further into previously unexplored tribal and forested regions near Kalinga (Odisa).. At its greatest extent, the empire stretched to the north along the natural boundaries of the Himalya, and to the east stretching into what is now Assam province near the border with modern Myanmar(Burma).
Under Chandragupta and his successors, internal and external trade, agriculture and economic activities, all thrived and expanded across India thanks to the creation of a single and efficient system of finance, administration, and security. Mauryan India also enjoyed an era of social harmony, religious transformation, and expansion of the sciences and of knowledge. Mauryans were followers of Budhissum and Hinduism. Chandragupta Maurya’s embrace of Jainism increased social and religious renewal and reform across his society, while Ashoka’s embrace of Buddhism has been said to have been the foundation of the reign of social and political peace and non-violence across all of South Asia. Ashoka sponsored the spreading of Buddhist ideals into Sri Lanka, Southeast Asia, West Asia and Mediterranean Europe. After the Kalinga war, the Empire experienced half a century of peace and security under Ashoka. Mauryan Empire’s decline began 60 years after Ashoka’s rule ended, and it dissolved in 185 BC with the foundation of the Shunga Dynasty in Magadha.