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It declared war against Japan after Japanese planes attacked the American naval base at Pearl Harbor, Hawaii. A few days later, Germany and Italy declared war against the United States.

President Franklin Roosevelt quickly decided that America could not fight major campaigns in the Pacific and in Europe at the same time. He and his advisers decided to fight first against the Germans and Italians. Then, when victory in Europe seemed sure, the United States could turn to fight the Japanese in Asia.

This left the Japanese free to extend their power throughout Asia and the western Pacific. Soon after the attack at Hawaii, Japanese forces invaded Hong Kong, Malaya and the Philippines. American forces in the Philippines suffered heavy losses. And Manila fell to Japanese troops. In February nineteen forty-two, Japan's forces won a great victory against the British in Singapore.

Japanese forces marched into Burma. They attacked Ceylon -- now Sri Lanka -- and captured the Andaman Islands in the Bay of Bengal. The Japanese military forces seemed too strong to stop.

President Roosevelt sent some forces to the Pacific. And he began to rebuild the American naval forces destroyed at Pearl Harbor.

But he sent most of America's military strength to Europe. The United States rushed troops and war equipment to help Britain survive against Adolf Hitler's Germany.

American military leaders wanted to fight Germany quickly by launching an attack across the English Channel. But British Prime Minister Winston Churchill opposed this. He and others feared such an invasion might fail.

So, British and American forces attacked Italian and German occupation troops in North Africa. They defeated them, and then crossed the Mediterranean Sea to attack enemy forces in Sicily. Within weeks, they pushed the Germans out of Sicily to the Italian mainland. The Allied invasion of Italy followed.

Hitler could not strengthen his forces in North Africa and Italy, because Germany also was fighting hard in the Soviet Union.

Hitler's decision early in the war to attack the Soviet Union was a serious mistake. It divided his men and materials. His plan was to defeat Soviet forces quickly with one strong attack. But he failed. And his failure cost him valuable troops and supplies that might have helped him win the battles for North Africa and Italy.

Germany's attack on the Soviet Union began with great success.

In the middle of nineteen forty-one, a German force of more than three million men invaded the Soviet Union. It captured the Ukraine, took control of Kiev, and marched deep into Russia.

The situation changed the following year. Soviet forces under Marshal Georgy Zhukov won a fierce battle for the city of Stalingrad --now Volgograd. A great many German soldiers died from cold and hunger during the bitter winter months that followed.

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Zhukov's forces attacked the German troops and pushed back the invaders. Other Soviet troops forced the Germa本论文由英语论文网提供整理，提供论文代写，英语论文代写，代写论文，代写英语论文，代写留学生论文，代写英文论文，留学生论文代写相关核心关键词搜索。