Britain could be considered conquered in AD (Anno Domini [After the Birth of Christ]) 60.
Here is a link to the research I found:
http://www.historyonthenet.com/Romans/invasion_of_britain.htm
Briton is not a place, it is what the Ancient Romans called the inhabitants of Britain when it was part of The Roman Empire.
Because of Roman greed they invaded briton to obtain more money and possibly more slaves.
They lived in tribes (groups).
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The Romans decided to conquer all of Italy because they wanted to expand their empire.
Briton is not a place it is the name given to the inhabitants of Britain by the Ancient Romans. Kent is a county in Southern England, a part of the island of Great Britain.
Of course the Romans did not conquer the US. The US did not exist at the time of the Roman Empire, and in any case, the Romans had no idea that the American continents existed.
The Romans never conquered the Seleucid Empire.
The Romans improved travelling conditions by building roads and bridges.
The Romans did not conquer anything in 1948.
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No because the Romans came in an AD date which means after Christ.