History of the world
Whether in prehistoric or historic times, people always needed to be near reliable sources of potable water. Settlements developed on river banks as early as 3000 BCE in Mesopotamia, on the banks of Egypt's Nile River, in the Indus River valley, and along China's rivers. As farming developed, grain agriculture became more sophisticated and prompted a division of labour to store food between growing seasons. Labour divisions led to the rise of a leisured upper class and the development of cities, which provided the foundation for civilization. The growing complexity of human societies necessitated systems of accounting and writing.
Pakistan
Some of the earliest ancient human civilisations in South Asia originated from areas encompassing present-day Pakistan. The earliest known inhabitants in the region were Soanian during the Lower Paleolithic, of whom stone tools have been found in the Soan Valley of Punjab. The Indus region, which covers most of present day Pakistan, was the site of several successive ancient cultures including the Neolithic Mehrgarh and the Bronze Age Indus Valley Civilisation (2,800–1,800 BCE) at Harappa and Mohenjo-Daro.
The Vedic period (1500–500 BCE) was characterised by an Indo-Aryan culture; during this period the Vedas, the oldest scriptures associated with Hinduism, were composed, and this culture later became well established in the region. Multan was an important Hindu pilgrimage centre. The Vedic civilisation flourished in the ancient Gandhāran city of Takṣaśilā, now Taxila in the Punjab, which was founded around 1000 BCE. Successive ancient empires and kingdoms ruled the region: the Persian Achaemenid Empire (around 519 BCE), Alexander the Great's empire in 326 BCE and the Maurya Empire, founded by Chandragupta Maurya and extended by Ashoka the Great, until 185 BCE. The Indo-Greek Kingdom founded by Demetrius of Bactria (180–165 BCE) included Gandhara and Punjab and reached its greatest extent under Menander (165–150 BCE), prospering the Greco-Buddhist culture in the region. Taxila had one of the earliest universities and centres of higher education in the world, which was established during the late Vedic period in 6th century BCE. The school consisted of several monasteries without large dormitories or lecture halls where the religious instruction was provided on an individualistic basis. The ancient university was documented by the invading forces of Alexander the Great, "the like of which had not been seen in Greece," and was also recorded by Chinese pilgrims in the 4th or 5th century CE.