Like the Mughal Empire, India today is also made up of many social and cultural units. Does this pose a challenge to national integration?

No, this does not pose a challenge to national integration because:

1. We have a unified system of government that has the same rules and regulations for all the citizens irrespective of religion, region, etc.
2. We have a constitution guarding the rights of all and specifying their duties.
3. Now we are unified as a nation, not as distinct states or regions of different rulers.