In India, as recent as latter part of this decade archeologists found gold mine of evidence for >2100 year old Tamil civilization at Keezhadi including Roman artifacts[0].
There was no evidence of Hinduism found, for the matter of fact no religious artifacts of known organised religions was found there.
The archeologist who made the discovery was transferred and the excavations was halted. Fortunately, Tamil civilization is still very much in existence in the state of Tamilnadu,India; so the matter was taken to court and the court has now ordered continuation of excavation at Keezhadi & ordered the original archeologist back to the site[1].
But there has been numerous hurdles since, a blatant obstruction by the central government.
India is a culmination of several such civilizations, but the ruling party wants to project India as a 'Hindu Nation' which magically originated before any other civilization in the world. Unfortunately, they have the popular support for obvious reasons (You'll likely witness in the comments ).
Wiki[2].
[0]: https://www.thehindu.com/news/cities/chennai/keezhadi-hittin...
[1]: https://www.thenewsminute.com/article/keezhadi-excavations-h...