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Germany tried to take over Poland (as a part of the Blitzkreig), but Great Britian and France stand up to Germany. And World War Two has officially begun.
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The Soviet Union wanted a buffer (an area of protection) between them and Germany just in case Germany attacks.
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Germany takes over a major allied power.
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Germany knows that if it can take London it will be able to control all of Great Britain, so they bomb london and start the Battle of Britain
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The United States gives Great Britain naval ships and supplies, and Great Britain gives the U.S. islands in the Caribbean (ex: Burma)
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Japan sneak-attacks naval base in Hawaii, causing the United States to declare war on Japan.
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Because the United States declared war on Japan, Germany decided that Japan couldn't fight the U.S. all by themselves, so Germany declared war on the United States.
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It's not like the United States is just going to sit there and accept the attacks from Japan and Germany, so the U.S. declares war on both of them. At this point, the United States is directly involved in the war.
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United States General Nimitz intercepted Japanese attacks, causing the first turning point of World War Two in the Pacific.
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Allied Forces incade France, which was the final push that defeated Germany.
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Germany attacks the Soviet Union, starting the Battle of Stalingrad. The Soviet Union finally wins, causing the first turning point of the war in Europe.
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The United States breaks through and beats Germany, starting the liberation of Europe.
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The United States tried to end the war, forcing Japan to finally surrender; World War Two is OVER.