When one reads History one has to take facts as they are, bearing in mind the geographical differences between then and now, the conditions existing during the period of study.
Unfortunately in India both seem to be at a premium.
People while reading Indian history were and still are dependent on foreign sources with agenda.
Most of the history taught in India is dis/misinformation by the rulers for over five hundred years.
This includes the Mughals and the British.
The Mughals had to keep their religion and empire intact and hence taught what was in their interests.
The Britishers had the same approach.
They went two steps further.
They first divided people based on Religion.
And introduced English. And they had psudeo researchers like Max Mueller to infiltrate Hinduism to make Indians lose respect for their texts.
Some of these Missionaries outwardly Embraced Hinduism and propagated Christianity.
People like Veeramamunivar in Tamil.
The nett result is Indians do not refer Indian texts and even if they do, they do so through English!
So Indian history looks to be confused and looks like fables.
But if one were to study Indian texts diligently with the approach that there was no south, north divide, nor was a linguistic chavunism.
And the land mass of Ancient times was different.
With this, let us look at Indian history.
The first major world war in indiay, called ten Kings war, Dadarjaniya war between two warring groups.
Essentially there were two major tribes or groups in India.
IT is worth remembering that the first Human being was Manuywho belonged to the southern hemisphere, called Dravida டிச.
The term Man is from Manu.
Manu had sons and a daughter.
When a Tsunami struck South, he, along with his son left for Ayodhya.
His son Ikshvaku founded the Surya Vamsa, Solar dynasty.
His daughter, Ila, who was left behind in South, here south meaning from the Saraswathi valley to the present south india, running through the coast of Arabian sea, which was not called thus then.
She married Chandra and had a son Budha.
Then came Puru.
This is the Lunar Dynasty, Chandra Vamsa.
All dynasties of India can be traced back to these two dynasties including the Tamil Kings Chera, Chola and Pandyas.
Please read my articles on Solar, Lunar and Tamil dynasties.
There were sub dynasties like Yadu, Thurvasa.
Some of these migrated outside Bharata kanda and settled around the world.
Hence we find remains of Hinduism everywhere in the world.
Reference and Citations.