Quote Originally Posted by QuintusSertorius
There was certainly a lot of mixing of peoples (all those people with Macedonian and Greek heritage as a result of Alexander, mixed Phoenician blood in Carthaginian holdings), but generally only the full-blooded received all the benefits of empire.

Rome was unique in extending it's citizenship beyond the original citizen body (even if it wasn't until after the Social Wars that all of Italy actually gained parity with Latium), with most other cultures citizenship was jealously guarded.

Later on particularly, regardless of your birth, if you were a Roman citizen, you enjoyed all the rights that entailed. Which included not paying taxation after 167BC.
actually, they did pay a really nasty inheritance tax from the Augustan period onwards.