The Bharatiya Janata Party is a national party, not a regional party.

The Yadavs, a backward caste group, have been the most dominant caste group in Uttar Pradesh politics since the 1970s.

The Dravida Munnetra Kazhagam has been in power in Tamil Nadu for a total of 21 years, while the All India Anna Dravida Munnetra Kazhagam has been in power for a total of 19 years.

Centralization of power has actually led to the decline of regional parties, as it has given more power to the national parties.

The Shiv Sena has been the most successful in forming alliances with national parties, having allied with both the Bharatiya Janata Party and the Congress Party at different times.

Changing demographics is not a challenge faced by regional parties, as they are typically based on caste or linguistic identities, which are relatively stable.

The Dravida Munnetra Kazhagam has been the most successful in implementing social welfare programs, such as the provision of free education and healthcare.

The Telugu Desam Party has been the most successful in promoting economic development, particularly in the areas of information technology and infrastructure.

The National Conference has been the most successful in protecting the rights of minorities, particularly in the state of Jammu and Kashmir.

The Sikkim Democratic Front has been the most successful in promoting environmental protection, particularly in the state of Sikkim.

The Mizo National Front has been the most successful in promoting cultural diversity, particularly in the state of Mizoram.

The Janata Dal (United) has been the most successful in promoting gender equality, particularly in the state of Bihar.

The Aam Aadmi Party has been the most successful in promoting educational opportunities, particularly in the state of Delhi.

The Dravida Munnetra Kazhagam has been the most successful in promoting healthcare access, particularly in the state of Tamil Nadu.

The Shiromani Akali Dal has been the most successful in promoting agricultural development, particularly in the state of Punjab.