1. Meiji Restoration
2. Treaty of Kanagawa
3. Sino-Japanese War
4. Russo-Japanese War
This tells us that China was in need of protection, and were willing to take such a huge step for the safety of their empire. We know this is true, as when the wall was built, it was in the middle of the Qin dynasty, and Shi Huangdi wanted to protect China from the Huns. Hope this helped!
