What were a few of the inventions that ancient China contributed to world civilization?

The Pax Romana was said to be a peaceful time of prosperity in Rome. But was all of it really peaceful? No, although Rome wasn't fighting any wars, they still had internal struggle as an empire. After the Civil Wars, Rome went through 27BC-180AD, which is a 200-year period called the Pax Romana, which means peace. The Pax Romana lasted from 27 BC until 180 AD. It started when Augustus Caesar was Emperor (ruler) of the Roman Empire. The main good things that happened in this time were: There were not many wars. Pax Romana which is Latin for "Roman Peace" was a time, as the name suggests, a long period of peace and minimal military expansion from 27 BC to about 180 AD. The main importance was that all of the land surrounding the Mediterranean was at peace because everyone was under Roman Law.