This book chronicles Indian history from 1930 onwards and in its prologue (Unnatural Nation), starts with an observation that a multi ethnic and plural and geographically diverse nation like India existing is little beyond conventional logic.
When India got independence, Mahatma was perhaps only leader to have a unique appeal cutting across religion and age groups. What's more Indian National Congress heeded to his every advice.Unfortunately after his assassination, a turmoil happened. But as destiny would have it, Gandhiji, didn't have any political ambitions and a class of able leaders was available (Nehru, Sardar Patel, Shastriji...). Luckily they also realized post painful partition of country, that it would be difficult to keep nation together, unless democracy reaches the most down trodden. this meant proper representation and certain laws that were enacted (like land ceiling, taking away royal titles, discouragement and later abolishment of zamindari system) had far reaching effects.
Although economic conditions weren't good for nearly 2-3 decades after independence (mostly owing to idealistic Nehruvian economics) and youth still disillusioned, education system became stronger and when generation born after independence started to enter mainstream, the skills they had, began to generate a positive momentum.
& while all this was happening, Army knew that people still had faith in democracy and hence people's rule prevailed over anything else.