What issue did the Bharatiya Jana Sangh strongly advocate for?

Bharatiya Jana Sangha:
The Bharatiya Jana Sangh was founded in 1951 by Shyama Prasad Mukherjee, with its lineage traced back to the Rashtriya Swayamsevak Sangh (RSS) and the Hindu Mahasabha.
Jana Sangh emphasized the idea of one country, one culture, and one nation, believing that India could progress and become strong based on its culture and traditions.
The party advocated for the reunification of India and Pakistan in ‘Akhand Bharat’ & opposed granting concessions to religious and cultural minorities.
It actively supported the replacement of English with Hindi as the official language of India and called for India to develop nuclear weapons after China's atomic tests in 1964.
In the 1950s, Jana Sangh had limited success in electoral politics.
Its support base was primarily in urban areas of Hindi-speaking states like Rajasthan, Madhya Pradesh, Delhi, and Uttar Pradesh.
Prominent leaders of the party included Shyama Prasad Mukherjee, Deen Dayal Upadhyaya, and Balraj Madhok.
The Bharatiya Janata Party (BJP) traces its roots to the Bharatiya Jana Sangh.