It's roads to connect different parts of their empire. Just finished the test :)
It was feudalism. you have to look at the frame of the crusades.
The judicial branch enforces the law; making sure it is carried out and people oblige to it. They also determine if the policy is constitutional or unconstitutional.
The technology, logistics, and communication of the north that allowed them to defeat the south is because of their skill of having to manufacture supplies and weapons that they need for the war. They were able to create more weapons and be able to hire more soldiers.
Hope this helped :)
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