Answer:
Achievements of each civilization:
Sumer - first recorded civilization in world history according to historians, first system of writing (cueniform script).
Ancient China - the four great inventions: paper, gunpowder, the compass, and the printing press.
Ancient Hindus Valley Civilization - first civilization to incorporate sanitation infraestructure in their cities.
Ancient Persia - first to develop a trade route that connected Asia, Europe and Africa. First to develop a postal service.
Inca Empire - terrace farming in a very steep geography.
Mayan Empire - great achievements in astronomy, including the famous Mayan calendar. Impressive Pyramids that rival those of Ancient Egypt.
Of the achievements that you identified, which do you think had the biggest significance in world history? Why?
All the achievements listed above are quite impressive, however, it is probable that the most influential achievement is Ancient China's four great inventions.
Paper and the printing press changed the writing industry. Gundpowder chaged war forever, making gundpowder weapons the most common choice for war. The compass also changed navigation systems.
These four inventions were groundbreaking.