Rome was a republic before it was an empire. Romans had the first Senate, elected by the people. The third option is also correct, because even the if the emperor did something that was against the law, he would be put on trial. Also the last one, those are called "Law's" You find them everywhere. xD Hope I helped :)
You could check out this website:
https://newrepublic.com/article/126987/remaking-american-west
or this one:
http://www.ushistory.org/us/18e.asp
i'm not really sure what info you want tho..
Answer:
The Indus civilisation's economy appears to have depended significantly on trade, which was facilitated by major advances in transport technology. Many Indus artifacts including jewelry, fabrics, and the famous Indus Seals have been discovered in the ancient cities of Iraq.
