Japan at that time

Japan was warring intensely against China, the U.S. and other countries.

During early Showa, Japan was in a deep depression and the people were increasingly dissatisfied with the government. Some militarists believed that having access to the abundant natural resources in north-eastern China (the province of Manchuria) forcibly created the country Manchuria, intending to rule it as they pleased. The Chinese people began to resist fiercely. Thus Japan and China began a war that dragged on over ten years
   Also, in 1941, Japan carried out a surprise attack on Pearl Harbor in Hawaii, declaring war against the U.S., Britain, and other countries. This was the beginning of what was called the Pacific War.
   The Japanese army had the advantage initially, but then lost a succession of battles for Pacific islands and Southeast Asian regions. In 1944, American warplanes began invading Japanese air space and dropping bombs on Japanese cities.

●The spreading war enveloped the Pacific Ocean.