The committee of correspondence was created so that the colonists could communicate with one another leading up to the American Revolution. The committees of correspondence worked to organize and build momentum for an independence movement within the colonies.
In the year 100 it would only be logical to try to keep protests down. With an empire stretching from Northern Scotland All the way to Rome Italy. If you tried to simply suppress a population that large every loyal Roman Man would have to drafted and sent to the Legions to fight their own disloyal subjects. While if they keep the barbs content they can turn their eye to their enemies such as Boadicea or the Parthians.
As humans dispersed from the equator peoples skin got lighter and lighter because of fewer exposure to sun radiation.
They didn't get tanned as much :)
