I WONDER - What Is The Great Wall Of China?

The Great Wall of China is a vast series of fortifications built to protect Chinese states from invasions. Constructed over centuries, it spans over 13,000 miles, making it the longest wall in the world. The Wall's primary purpose was to defend against nomadic groups from the Eurasian steppe.

Over what time period was the Great Wall of China constructed?

Which groups did the Great Wall of China aim to protect against?