The Bhartiya Janta Party (BJP) came to power in 1998 as the leader of National Democratic Alliance (NDA).

The Bharatiya Janata Party (BJP) is one of the major political parties in India. It was founded in 1980 and is considered as the political wing of the Rashtriya Swayamsevak Sangh (RSS), a Hindu nationalist organization. The BJP has been in power multiple times at both the central and state levels.

In 1998, the BJP emerged as the leader of the National Democratic Alliance (NDA) and came to power at the center.

National Democratic Alliance (NDA):
The National Democratic Alliance (NDA) is a coalition of political parties in India, led by the BJP. It was formed in 1998 and has been in power at the center for multiple terms. The NDA is a center-right political alliance that brings together various regional and national parties with similar ideologies.

Factors that led to the BJP's rise to power in 1998:

1. Political Landscape: The political landscape in India during the late 1990s was characterized by a fragmented party system. The Indian National Congress, which had traditionally dominated Indian politics, was facing internal conflicts and was losing its grip. This created an opportunity for the BJP to emerge as a major political force.

2. Ayodhya Movement: The BJP's rise to power was also influenced by the Ayodhya movement, which aimed to construct a Hindu temple at the disputed site in Ayodhya, Uttar Pradesh. The BJP actively championed the cause of the Ram Janmabhoomi movement, which resonated with the Hindu majority population.

3. Economic Reforms: The BJP's pro-market economic policies and support for economic reforms also appealed to a section of the electorate. The party advocated for liberalization, privatization, and globalization, which were seen as necessary steps for India's economic growth.

4. Leadership: The BJP had charismatic leaders like Atal Bihari Vajpayee and L.K. Advani, who played crucial roles in shaping the party's image and attracting a wider support base. Their leadership skills and ability to communicate effectively with the masses contributed to the BJP's rise to power.

5. Coalition Building: The BJP successfully built alliances with regional parties and formed the NDA, which helped it expand its political base and gain support from different regions of the country. The NDA's broad-based alliance played a significant role in the BJP's electoral success.

In conclusion, the BJP came to power in 1998 as the leader of the National Democratic Alliance (NDA), which was a coalition of political parties. The party's rise to power was influenced by various factors, including the political landscape, the Ayodhya movement, economic reforms, effective leadership, and coalition building.