They removed existing rulers from the conquered lands to ensure they had direct control of their enemies' trade routes. They forced all the people they conquered to trade directly with them, increasing their wealth from the sale of additional goods. They took all conquered people as prisoners and forced them to work as slaves on public works projects. The tribute demanded from conquered peoples provided warriors for defense, as well as food and resources for their own people.
Most of the time in monarchies the rule is passed down through the bloodline, so my train of thought is feudalism.
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Patents protected inventors and let them profit from their invention
The sides both expected a speedy triumph yet they weren't right as the war went on for a long time ending the lives of numerous. The main real skirmish of the Civil War was the First Battle if Bull Run. The Confederacy won which stunned Northerners and made them understand that the war could be long and troublesome.