What was the main purpose of the Great Wall of China?

The Great Wall of China is a series of fortifications built across the historical northern borders of ancient Chinese states and Imperial China. It was originally built to protect Chinese empires against invasions from nomadic groups. While often referred to as a single entity, the Wall is actually a collection of walls built over many centuries.

What was the main purpose of the Great Wall of China?

1. A.To facilitate trade routes
2. B.To serve as a monument to past emperors
3. C.To protect against invasions
4. D.To mark the boundaries of Imperial China