Bihar is the state that was not created in 2000. Here's an explanation of why:

Reasons for the Creation of New States:
The creation of new states in India is primarily based on the linguistic and cultural identities of the people residing in a particular region. Historically, the demand for separate states has emerged due to factors such as regional imbalances, aspirations for self-governance, and the need for better administration and development.

Creation of Jharkhand:
Jharkhand is a state located in the eastern part of India. It was carved out of the southern part of Bihar in the year 2000. The region had a significant tribal population and rich mineral resources like coal, iron ore, and mica. The demand for a separate state of Jharkhand had been a long-standing aspiration of the local tribal communities. They sought greater control over their resources and governance, which they believed would lead to better socio-economic development in the region. After years of protests and movements, the state of Jharkhand was finally created on November 15, 2000.

Creation of Chhattisgarh:
Chhattisgarh is a state located in central India. It was formed by separating 16 southeastern districts of Madhya Pradesh. The demand for a separate state of Chhattisgarh was primarily driven by socio-economic factors. The region had a significant tribal population and was rich in mineral resources like coal, iron ore, and bauxite. The proponents of the separate state argued that the region was neglected in terms of development and administration. They believed that a separate state would lead to better governance and more focused development efforts. Chhattisgarh was officially established on November 1, 2000.

Creation of Uttaranchal (now Uttarakhand):
Uttaranchal, now known as Uttarakhand, is a state located in the northern part of India. It was carved out of the hilly regions of western Uttar Pradesh. The demand for a separate state of Uttaranchal was primarily driven by regional imbalances and the unique cultural identity of the hilly areas. The people of the region felt that their distinct identity and developmental needs were overshadowed by the more populous plains of Uttar Pradesh. They sought a separate state to address their concerns and ensure focused development efforts. Uttaranchal was officially formed on November 9, 2000.

Conclusion:
In conclusion, while Jharkhand, Chhattisgarh, and Uttaranchal (now Uttarakhand) were all created as separate states in 2000, Bihar remained unchanged and was not divided to create a new state. The creation of these states aimed to address regional imbalances, fulfill the aspirations of the local communities, and promote better administration and development in the respective regions.