If the emperor needed to send the legions here, he would, L.E.J. It has not proven necessary to do that. Caesar simply bought us out instead over the last 5 or so decades. We've been effectively subjugated since the early 60s, to all intents and purposes.

As for Vercingetorix, the first time he was brought before Caesar was in Gaul, following the decisive Gallic defeat at their capital, Alesia. (It had been a very close run thing...Caesar could well have lost the Battle of Alesia, in which case his career would have had a bloody and sudden end in central Gaul.)

After the battle Vercingetorix rode in on a horse before the assembled Roman legions to kneel done before Caesar and surrender, he gave up his sword, then they took him off to Rome to entertain the mob, and eventually they strangled him in some Roman prison.

There are two ways to work with regards to the Empire. You can fight it...which is fine if you wish to die gloriously...or you can let the Empire in to do business in your country as they wish to, in which case you surrender much of your national sovereignty and most of your cultural identity over a period of time, but you get to live comfortably. This was true in the days of Rome too...except no Walmarts! ;-)