Well, people started specializing in things and if they couldn't get something because they didn't know how to make it, they would trade for it. Fast forward 8000 years, companies like Coca Cola make coke and fanta and others can't make it because they're specialized for it. They trade for it with the entire world and other companies make things that Coca Cola owners buy.
Answer:
I can't answer 13, but 14 is silk, ancient China kept secret the way to make silk because (15) it gave them an advantage in trade (the silk road) because other countries would trade their goods for silk since china wouldn't tell them how to make it. Hope this helps!
The major advantage is that the states have their own right to choose which laws will apply to them and in what way, based on their own interpretation of the laws.
