Well they began considering it because they didn't want another armed revolt like the Americas did. So they peacefully let them leave. Also they let them leave so they could be allies and be valuable trading partners. Also they knew they had enough to deal with like the threat of the cold war bombing. Plus they didn't want India turning to Soviet communism influence. This a basic summary of why they peacefully seceded India and let them become their own country.
What made him so famous was he was a preacher that was capable of commanding thousands on two continents through the sheer power of his oratory. He preached at least 18,000 times to 10 million hearers.
Thinking he guided the litigation that destroyed the legal under prinnings of JIM crow SEGREGATION
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Yes the end of the 20th century was also the end of Western dominance in world history.