Final answer:
Japan invaded China in both 1931 and 1938.
Step-by-step explanation:
Japan invaded China in both 1931 and 1938.
In 1931, Japan invaded Manchuria, a region in northeastern China. This invasion was known as the Mukden Incident and led to the establishment of the puppet state of Manchukuo.
In 1938, Japan launched a full-scale invasion of China, known as the Second Sino-Japanese War. This invasion lasted until 1945 and resulted in widespread devastation and loss of life.