Question

What were the greatest achievements of China's Han Dynasty?

Developing early gunpowder.

Building the Great wall.

Creating the first warning.

Inventing the first paper.

Answer 1

I meant what was the greatest achievements of China's Han Dynasty?

Developing early gunpowder

Building the Great Wall

Creating the first writing

Inventing the first paper

Answer 2

Short answers for the four items you listed:

- Developing early gunpowder — No. Gunpowder was invented much later (Tang–Song periods, centuries after the Han).
- Building the Great Wall — Partly. The Han expanded, repaired and extended frontier walls and built beacon towers, but the most famous Qin and much later Ming work are better known as “the” Great Wall.
- Creating the first warning — Unclear wording. If you mean an early earthquake detector/warning device: yes — Zhang Heng (Han, 132 CE) built the first known seismoscope that signalled distant earthquakes. If you mean a general “first warning” concept, that’s too vague.
- Inventing the first paper — Yes. Paper-making (often credited to Cai Lun, Eastern Han, ca. 105 CE) began in the Han and is one of its major inventions.

Other major Han achievements worth noting (brief):
- Establishment of a long-lasting centralized bureaucracy and adoption of Confucianism as state ideology.
- Opening and promoting the Silk Road, expanding trade and cultural contact with Central Asia and beyond.
- Advances in metallurgy, agriculture (iron tools, improved plows), and shipbuilding.
- Important scientific work: astronomy, calendar reform, medicine, and historiography (Book of Han).
- Large public works: roads, canals, frontier defenses and garrisons.

If you want, I can rank these achievements or give dates and short bios for key figures (Cai Lun, Zhang Heng, Ban Gu, etc.).