Charles Darwin had a mountain named after him, Mount Darwin, “A man who dares to waste one hour of time has not discovered the value of life.”
Imperial leaders model of trade was mainly based on mercantilism principles.
Trade was heavily skewed against the conquered lands. Finished goods were exported to the colonies while it is only raw materials that the colonies would export to the colonial master.
France expected that their colonies would always be part of France. Britain trained their colonies to be self-governing.
Well first of all it consisted of Romans, rather than Greeks. It also depended much more on heavy infantry, which was organized into maniples of 120 men.