Second Sino-Japanese War
5 countries took part.
Read about Second Sino-Japanese War on Wikipedia
| Country | Years |
|---|---|
 Japan
|
1937 to 1945 |
 People's Republic of China
|
1937 to 1945 |
 Russia
|
1937 to 1945 |
 Taiwan
|
1937 to 1945 |
 United States
|
1937 to 1945 |