why hindi is cosidered as 2nd language in most of the states in india?

Answer 1

Hindi is the mother tongue of about 337 million Indians, or about 40% of India's population that year according to the census 1991.
Hindi is one of the most widely spoken languages in the world, due to the large population of India.

So you dont have the right figures or perception.
Click the link below for more information.

Hindi is the predominant language in the states and union territories of Himachal Pradesh, Delhi, Haryana, Uttar Pradesh, Madhya Pradesh, Bihar, Uttaranchal, Jharkhand, Rajasthan and Chattisgarh. Linguistic scholars refer to this area as Hindi belt. Outside these areas, Hindi is widely spoken in cities like Mumbai, Chandigarh, Ahmedabad, Kolkata, and Hyderabad, all of which have their own native languages but harbour large communities of people from various parts of India.

But because south indians evolved from a dravidian culture which is an entirely different race from the aryan ppl of northern india so they have an entirely diffeent sets of dravidian languages.
But still hindi remains the most spoken language in India.

And most ppl in north do speak hindi.

I hope this clears your doubt.

Have a nice day.

:)

Answer 2

Not sure exactly, but it seems to work in their favor as far as the job market goes for it work, etc. I think they are very smart for doing things like they are.

Answer 3

'cause
english is the first language