Actually, untouchability was only legal under British Rule. As soon as India became independent, the government banned caste discrimination. The author of the Indian constitution was an untouchable. No western constitution has been written by a member of a discriminated class/race.

This is in contrast to western countries, where segregation was legal till the 1960s. In British ruled Hong Kong, the Chinese were not allowed to vote till 1993. In Dutch/Boer ruled South Africa, the blacks could not vote till 1994. In Canada, the natives couldn't vote till 1960 unless they renounced their treaty rights.

Read, Dookie, read. Even the untouchables are better educated and informed than you.