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The United States would finally go to war against Hitler and the other Axis nations. But its first battle would not be in Europe at all. Instead, the United States would enter World War Two following a surprise attack by Japan on the large American naval base at Pearl Harbor, Hawaii.
Relations between the United States and Japan had grown steadily worse throughout the nineteen thirties. Both nations were important industrial powers. But they had very different ideas about the economic and political future of East Asia, especially China.
Until the late eighteen hundreds, Japan had been a nation with ancient political traditions and little contact with the Western world.
Visits by Commodore Matthew Perry and American warships helped open Japan to trade with the United States and other nations in the eighteen fifties. And in the years that followed, Japan took major steps toward becoming a modern industrial nation.
By the nineteen twenties and thirties, Japan was a strong country. But it lacked oil, rubber and other natural resources of its own. For this reason, Japanese political leaders looked with envy at the Dutch, French and British colonies across Southeast Asia and the Pacific. And Japanese business leaders saw huge markets for their products in nearby countries like Korea and China.
Japan's desire to use East Asia to gain natural resources and sell manufactured products was in direct conflict with American plans for Asia. This was especially true concerning China. Washington created an "Open Door" policy toward China. It wanted to keep China's natural resources and markets free from control by Japan or any other nation.
For this reason, Americans were very concerned when Japanese forces invaded the Manchuria area of China in nineteen thirty-one. And they watched with great interest the efforts of Chinese leader Chiang Kai-shek to oppose the Japanese invaders.
The United States was also very concerned bout protecting its imports of oil, tin and rubber from Southeast Asia. This area of the world was a major supplier of these resources in the nineteen thirties. The Middle East had not yet become a leading producer of oil.
In these ways, the United States and Japan were competing for the same resources and Asian markets. However, there also was a good deal of trade between the two nations. In fact, Japan depended on the United States for most of its metal, copper and oil.
This trade with Tokyo became a major concern for President Franklin Delano Roosevelt and the Congress in nineteen thirty-seven.
In the summer of that year, more Japanese troops moved into China. They quickly captured much of the Chinese coast.
Much of the metal, oil, and other materials that Japan used for its war effort in China came from the United States. Americans did not like selling Japan materials to use against China. But the trade was legal because of a nineteen eleven agreement between Tokyo and Washington.
However, the American government told Japan in nineteen thirty-nine that it would end the earlier agreement. It would no longer sell Japan materials that could be used for warWashington's decision made the Japanese government think again about its expansionist plans. And the announcement a month later of a non-aggression treaty between Germany and the Soviet Union gave Tokyo even more cause for concern. The Soviet Union could be a major opponent of Japanese expansion in East Asia. And it appeared free from the threat of war in Europe.
These two events helped moderates in the Japanese government to gain more influence over foreign policy. A moderate government took power in January nineteen-forty.
However, this period of moderation in Tokyo did not last long.
In the spring of nineteen forty, Germany launched its blitzkrieg, or lightning invasion, of Europe. The Nazis captured Denmark, Norway, the Netherlands, Belgium, Luxembourg, and finally France.