Nation-building is constructing or structuring a national identity using the power of the state. Nation builders are those members of a state who take the initiative to develop the national community through government programs, including military conscription and national content mass schooling.

Nation building refers to the process of constructing a strong and cohesive nation through various means, such as political, economic, social, and cultural reforms. It involves the development of institutions, infrastructure, and policies that promote national unity, identity, and progress.

Pt. Jawaharlal Nehru, the first Prime Minister of India, played a significant role in nation building. His contributions can be broadly categorized into the following areas:

1. Political Reforms: Pt. Nehru was instrumental in drafting the Indian Constitution, which laid the foundation for a democratic and secular nation. He also worked towards the integration of princely states into the Indian Union, which helped in strengthening the country's territorial integrity.

2. Economic Development: Nehru believed in the importance of economic development for building a strong nation. He introduced the concept of planned economic development in India, which focused on industrialization, infrastructure development, and agricultural reforms.

3. Education and Science: Nehru was a strong advocate of education and science. He established several educational and scientific institutions, such as the Indian Institutes of Technology and the Indian Institutes of Management, which have contributed significantly to the development of the country.

4. Foreign Policy: Nehru played a crucial role in shaping India's foreign policy, which emphasized non-alignment and peaceful co-existence with other nations. He also worked towards building strong ties with other developing countries, which helped in promoting India's global image.

In conclusion, Pt. Nehru's contributions in nation building were diverse and impactful. His vision for a modern and progressive India has helped shape the country's development trajectory and has left a lasting legacy for future generations.