The most accurate timeline that identifies the cause of aggression and conflicts that led to the events in Nanjing and contributed to the beginning of World War II is:
Date: Aggression and Conflicts
- 1850s: Japan uses gunboat diplomacy to force trade with the Chinese.
- 1931: Japan seizes Manchuria from China.
- 1937: Japan invades the mainland of China, claiming Beijing and Shanghai.
This version correctly identifies Japan's use of gunboat diplomacy within the correct historical context, the seizure of Manchuria, and the invasion that led to further conflict. However, note that Japan did not seize Nanjing until the events of the Second Sino-Japanese War in 1937.
The timeline highlights the escalating tensions and aggressions leading to conflicts in the region.