Ditches were dug either side of the road to allow for drainage. Roman roads tended to be built higher than the level of earth around them – this, again, helped drainage. The bulk of the actual building was done by Roman soldiers. By doing this, the Romans could rely on the gained expertise of the soldiers.
The answer might be sugar beets. But I'm not positive.
Sumerians buildings were more like artificial hills and the art work was mainly about exploring and supporting the relationships between people and the gods
James I quarreled with Parliament because he believed in the divine right of kings, particularly that he should be all-powerful, while Parliament was more democratic and wanted more power to the people.
Religion is more important in my opinion