Negative population growth rate means that the population of a particular state is decreasing over a given period of time. As per the Census 2011, the state of Nagaland in India had a negative population growth rate.

Here is an explanation of why Nagaland has a negative population growth rate:

1. Introduction:
- Census 2011: The Census of India is conducted every 10 years to gather demographic data about the country.
- Population growth rate: It indicates the rate at which the population of a particular region or state is increasing or decreasing.

2. Population growth rate in Nagaland:
- Negative growth rate: The population growth rate of Nagaland is negative, which means that the population is declining.
- Decrease in population: The number of people in Nagaland has decreased over the years.
- Census data: The Census 2011 data showed a decrease in the population of Nagaland compared to the previous census.

3. Factors contributing to negative population growth rate in Nagaland:
- Migration: One of the major factors contributing to the negative population growth rate in Nagaland is migration.
- Out-migration: Many people from Nagaland migrate to other states or countries in search of better education, employment, or living conditions.
- Limited opportunities: Nagaland faces challenges in terms of limited economic opportunities and infrastructure, which leads to people seeking better prospects elsewhere.
- Armed conflict: The state has witnessed armed conflict and unrest, leading to displacement and migration of the population.

4. Other reasons:
- Low birth rate: Nagaland also has a relatively low birth rate, contributing to the negative population growth rate.
- Aging population: The state has a significant proportion of elderly population, which further contributes to the declining population.

5. Implications of negative population growth rate:
- Socioeconomic impact: Negative population growth rate can have socioeconomic implications, such as a shrinking workforce and reduced economic productivity.
- Infrastructural challenges: It can also pose challenges in terms of maintaining infrastructure and providing essential services.

In conclusion, Nagaland has a negative population growth rate as per the Census 2011 due to factors such as migration, limited opportunities, armed conflict, low birth rate, and an aging population. This trend highlights the need for addressing these challenges and promoting sustainable development in the state.