Julius Caesar invaded in 55 and 54 BCE to deter and punish the Britons for assisting their kindred people revolting in Gaul. He levied hostages and tribute, establishing client kings to maintain the peace and produce the tribute. Problems arose in this arrangement, with two kings fleeing to Rome for protection. Augustus considered invading to restore the situation but other problems elswhere in the empire took priority, and Augustus decided to establish defensible borders rather than continue expansion of the empire.
By the 40s CE, however, the situation between the petty kings had deteriorated, with the pro-Roman ones threatened, and the tribute not flowing. In 43 CE Claudius dispatched an army to take Britain and establish stable governance over the disputing kingdoms. This ensured access to a stable level of taxation and to the mineral suppies (especially tin). Part of the Pax Romana, and the financing of the Empire.
about 3/4 of Britain was occupied by the Romans
No, the Romans had left Britain's shore a long time before James the first became king.
The Romans never conquered the Seleucid Empire.
The french
The Romans improved travelling conditions by building roads and bridges.
about 3/4 of Britain was occupied by the Romans
No, Nero already had Britain. His stepfather, Claudius, had taken possession of Britain in 43.
No, the Romans had left Britain's shore a long time before James the first became king.
Great Britain did not conquer Spain.
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
The Romans decided to conquer all of Italy because they wanted to expand their empire.
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 french
The Romans improved travelling conditions by building roads and bridges.
Britain was invaded by the Romans.
Britain.