So when did Rome like... become a thing ?

So when did you like....become incoherent?

Read some books

Around 400 BC as a practical matter, in that it was becoming obvious by that stage that Rome was expansionist and might in due course occupy quite a bit of Europe and the Mediterranean coasts.

But it depends what you mean by "a thing". You could ask the same fairly vague question about all of the empires etc which have existed in the world. No single date, nor even a single century, could be quoted without some historians objecting.

it coincided with the decline of Greece which became all chiefs and no indians some of these Chiefs had to have been at the heart of the rise of Rome to the world stage the cultures were practically identical 400 BC

2005, give or take a few days

When Romulus and Remus founded it.

753 BC

10 seconds, and bazinga: https://en.wikipedia.org/wiki/Rome
- hit the link
- read

good one

A what? a city? an Empire? the centre of Christendom? what exactly are you thinking of?