No sooner Kalki Avatar manifests India will become greater India, a unified India with all countries like Pakistan, Afghanistan, Tibet, Nepal, Bhutan and Bangladesh, Myanmar and Sri Lanka, Maldives becoming part of greater India. The combined strength of India would be above 1600 million people. All countries would unite with India unilaterally without any external pressure.
This unification of India would occur in the aftermath of world war 3. A battle of Mahabharata always precedes advent of an Avatar and in times of Kalki Avatar humanity would witness the most catastrophic nuclear war of present era, the expected world war 3, a man-made tragedy. None could escape, not even a single country in world the fallout of world war three.
To cleanse the society of its ills, to put the society back on its pedestal, to re-establish Dharma (righteousness) God Almighty ordained advent of an avatar on mother earth every 3500 to 5000 years. Above 3650 years before advent Lord Krishna in Dwapar Yuga, in times of great strife, tribulation. At that time humanity witnessed Mahabharata, a full-scale battle between Kauravas and Pandavas. Eventually Lord Krishna succeeded in re-establishing Dharma (righteousness).
It is quite likely that India in the aftermath of world war three is renamed Bharatvarsha, a nation that truly promoted the philosophy of the people, by the people and for the people.
Kalki Avatar would also usher the entire world community into Satyuga, the awaited golden period.