If India, Pakistan, Bangladesh, Srilanka, Maldives, Nepal and Bhutan united?

Why this question arise? 

Over the past 70 years, India has succeeded to resolve border issues only with Srilanka and Bangladesh. India has a huge tension with neighbors regarding the border and natural resources. Non military issues like climate change, energy security, competition for scarce resources, food and water security, pandemics, migrations, etc., are getting securitized. India has faced 4 wars till independence. 

Indian sub-continent is huge, comprises of 7 countries, India, Pakistan, Bangladesh, Srilanka, Maldives Nepal and Bhutan. It will be a vast area of the region's population and cultural impact on our world. 

Currently India is facing lots of demographic issues with their neighbors, but at the same time Indian is showing lessons to developed countries, how to handle those issues to prepare for their own future. 

What if India and neighbors, that is India' and sub-continent re-united as one country?

How will it look like if all these countries are united. Let us assume  the name as "United India".

Population:

• The population would be a near 2 Billion about over 25% of the world's entire population. That is more people live in North America, South America and Europe combined. India alone has more people living 
• Let's look at Top cities. Top three cities of United India will be Delhi, Mumbai and Karachi all of which have higher populations than New York city in U.S.A.
• United India's Top 10 largest seven of them would be located in India and while two would be from Pakistan and one in Bangladesh.

Ethnic Groups:

• United India's ethnic groups can be divided different major families:
  

     

• Linguistic diversity will be:
  

                             

• United India's Religions will be: 
  

 In this more than 35% of the population would be living in cities.

GDP And Budget:

• United India combined nominal GDP would be $3.6 trillion. Which would make its the fifth largest economy in the world. GDP per capital would be $7,900 far below the global average which is $17,300.  
• Military budget will be in the need of 84 Billion US dollars. The United Indian army would have an active duty force will be 2.8 million and additions 2.1 million in reserves. 

Resources:

• United India will be high in natural resources.
• United India will have the largest manpower reserves in the world and it may lead to the highest unemployment rate. 
• Young age of the average citizen would be 27 years old.

Problems can be solved:

• Most of the problems would be solved if India and Pakistan re-united.
• The Ganges water sharing problem will be solved.
• The problems with illegal migration of Bangladeshi's would be resolved.
• The problems between Srilanka and Indian regarding the treatment of the Tamil's would be resolved.
• Border issues with all the neighbors will be solved. 
• In sports, imagine Indian batsman and Pakistan bowlers every cricket world cup will be ours.

If United India development is progressive it can be directed to a Superpower of the world.