Overview:
The RSS (Rashtriya Swayamsevak Sangh) is a Hindu nationalist, paramilitary volunteer organization in India. It was founded in 1925 by Keshav Baliram Hedgewar. The number of cadres the RSS had by 1940 was over 100,000.

Factors contributing to the growth:
- **Nationalistic fervor:** The period leading up to 1940 was marked by a strong sense of nationalism in India, with many individuals and organizations working towards independence from British rule. The RSS's emphasis on patriotism and cultural pride appealed to many people, leading to a significant increase in its membership.
- **Community outreach:** The RSS focused on reaching out to different communities and spreading its message through various means such as meetings, camps, and publications. This helped in garnering support and attracting new members.
- **Organizational structure:** The RSS had a well-structured organizational setup with a hierarchical system that facilitated the recruitment and training of new volunteers. This efficient system enabled the organization to expand its reach and grow rapidly.
- **Leadership:** The leadership of the RSS played a crucial role in its growth. Under the guidance of leaders like Hedgewar and later M.S. Golwalkar, the organization was able to inspire and motivate its members, leading to a surge in membership numbers.

Impact of the growth:
- The significant increase in the number of cadres by 1940 helped the RSS establish itself as a prominent nationalist organization in India.
- The expansion of its membership base allowed the RSS to have a broader influence and reach within Indian society, shaping the political and social landscape of the country.
In conclusion, the RSS's growth to over 100,000 cadres by 1940 was a result of various factors such as nationalistic fervor, community outreach, organizational structure, and effective leadership. This growth played a crucial role in solidifying the organization's position and influence within Indian society during that period.