1930s see Manchurian incident.
Also, united the Guomindang and Communists.
Second Sino-Japanese War happened on 1937-07-07.
Manchuria
China
The 1st Sino-Japanese War was 1894-1895. The 2nd Sino-Japanese War was the 1930's (1931, or 1933, or 1937, depending upon which history book you're reading).
Japan's incursion into Manchuria.
The clue is in the name, Sino -- to do with China.
The Second Sino-Japanese War
WWII.
chiang kai-shek
The First or Second Sino-Japanese War.
The Second Sino-Japanese War
Japanese Invasion of China 1931-1937 500,000 Japanese Deaths1937-1945 1,000,000 Japanese Deaths