At school when I read that in the entire world, India was the only sub-continent because of the vast differences in cultures and people in different States... I felt very proud.
As I grew up I realized that except Indian texts, not anyone else was referring to us or even hinting of using the word 'sub-continent' .. then I thought probably we Indians coined it ourselves for covering the differences our people have, and converted it into an USP.
The same thoughts came by, when I read 'Unity in Diversity' at school .. and afterwards felt whether we say that probably to hide our conflicts of not going well between different states.
Only recently, have I had opportunity to jump outside TamilNadu on to different states to see for myself ...the diversity we have... and if there was any Unity deep inside that diversity.
I am relieved I was not cheated at school... we do have conflicts between states or people from different states within the country.. but we do respect other people's traditions and give importance to our own traditions, and that's why we allow the diversity to exist. Slowly, there is a generation of people (include me), who think diversity should be within home and outside we are to think like indians, not Tamilians or Bangaloreans, or Maharashtrians. May be that would be against the idea of sub-continent.
I have not travelled vastly, but only to Darjeeling in the North-east, to Kerala in the south which were different worlds as compared to Hyderabad, Chennai or Bangalore.
The impact of growth in cities like Chennai, Hyderabad, Bangalore has almost made every other place in the states TamilNadu, Andhra Pradesh, Karnataka, such that even villages have a pacy lifestyle growth interests by making all cultivable lands into houses or commercial centers.
But, Darjeeling being a small hill-station, its people still fighting to be separated from being part of WestBengal, had a different walk of life in more traditional similarity with neighbours like China, Nepal, Bhutan, than India.
Darjeeling and almost all parts of Kerala gave me a sense of visiting a foreign place. Rich with green, people not just wearing but also looking their traditional ways.
I think I also got to understand why frequent travellers and globe-trotters say that just visiting places educated them about living a good life, and made them more nicer with people... I always thought they were covering their mistake of doing nothing else but just touring by saying those things.
I sometimes wonder, if all humanity arose from somewhere in Africa as they say, and later migrated to different parts of land which became countries and states because of rulers, how did differences in cultures, traditions, and even languages come about.
While your train enters from a neighbouring state into Kerala, you can tell that it has entered without requiring any information boards. Its just green everywhere, and less populated except for Cities like Cochin or Trivandrum I guess. I definitely didn't so much people as I would have in any place on Tamilnadu or even Maharashtra.
While entire North India's cities look very much like Chennai or Bangalore or Hyderabad in population and development, there is a different air of thought, pace of life, and cultural differences embedded into how people talk to one another or foods in north india very different from the south.