When did the second urbanisation in Ganga Valley take place?

The correct option is 6th Century BCE.

Step-by-Step Explanation:

1. Historical Context: The first era of urbanisation in ancient Indian history occurred during the Indus Valley (Harappan) Civilisation. After its collapse, society transitioned back to rural, agrarian living until the mid-first millennium BCE.

2. The Gangetic Urbanisation: Around the 6th Century BCE, urban centers re-emerged in the Indian subcontinent, primarily located in the fertile Ganga Valley (Gangetic Plains). This historical phenomenon is widely referred to as the Second Urbanisation.

3. Key Factors Behind the Second Urbanisation:
• Iron Technology: The widespread use of iron tools (axes, plows) allowed communities to clear dense Gangetic forests and till heavy alluvial soil, producing significant agricultural surpluses.
• Formation of Mahajanapadas: Agricultural prosperity supported political consolidation, giving rise to 16 major territorial kingdoms and republics (Mahajanapadas) with fortified urban capitals such as Rajgir, Pataliputra, Varanasi, and Vaishali.
• Coinage and Trade: Introduction of punch-marked coins replaced barter systems, stimulating long-distance trade, craft specialization, and merchant guilds.
• Socio-Religious Transformations: This era saw the emergence of heterodox philosophies, most notably Buddhism and Jainism, which flourished in these active urban hubs.

Thus, the second urbanisation in the Ganga Valley took place in the 6th Century BCE.