The ancient kingdom of Anga was located in the eastern part of Bihar, with its capital at Champa. It was mentioned in Vedic and post-Vedic texts.

The Kesaria Stupa, one of the largest stupas in India, was built to commemorate Gautama Buddha and contains important Buddhist relics and archaeological significance.

According to the accounts of Greek envoy Megasthenes and other ancient texts, the walls of Pataliputra had 64 gates. The city was also surrounded by a ditch and had multiple towers for defense and administrative purposes.

During the Mughal Empire, most of Bihar was part of the Subah Bengal, one of the richest provinces of the empire. This administrative division remained largely intact through much of the Mughal rule.

Bihar's industrial backwardness is due to multiple factors: insufficient infrastructure (roads, railways, ports), limited skilled workforce, inadequate capital availability, and lower technological adoption. Solutions include attracting Foreign Direct Investment, establishing SEZs, improving transportation networks, and implementing skill development programs. The state has been working on these through various government initiatives.

Using compound growth formula: Final Population = Initial Population × (1 + growth rate)^time. P = 100 × (1 + 0.025)^3 = 100 × (1.025)^3 = 100 × 1.0769 = 107.69 million

The Kosi River's unpredictable behavior severely impacts Bihar's agriculture. Effective strategies include: (1) Strengthening and maintaining embankments, (2) Afforestation in upstream areas to control erosion, (3) Community-based early warning systems, (4) Developing flood-resistant crop varieties, (5) Crop insurance schemes. International cooperation with Nepal for upstream management is also crucial.

The separation of Jharkhand in 2000 had significant implications: Bihar lost major mineral-rich areas and industrial hubs, reducing its revenue base and industrial capacity. However, it allowed Bihar to focus on agriculture, education, and service sectors. This reorganization affected resource allocation, tax revenue, and development priorities, though long-term impacts include better governance in smaller, manageable entities.