Answer:
Widespread use of concrete.
Step-by-step explanation:
Roman contribution to architecture is remarkable.
One of the main contributions of Romans to architecture is the use of concrete.
Roman architects realised that concrete could be made locally.
They realized that concrete has the qualities of:
- Strength compared to commonly used marble.
- Easily curved into desired shapes
- Cost effective since it could be produced locally.
- Could las longer than the commonly used marble.
This brought a revolution to the architectural field that even the emperor set a budget for concrete.