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The United States.
MacArthur
The United Kingdom, the Soviet Union, and the U.S. joined forces to defeat Nazi Germany for different reasons. The U.K. declared war on Germany in September 1939 after Germany (then allied with the Soviet Union) invaded the U.K. ally Poland. Germany on June 22, 1941, invaded the Soviet Union, breaking their alliance. After Pearl Harbor on December 7, 1941, the U.S. declared war on Japan, a German ally. Germany then declared war on the U.S., and the U.S. did likewise.
The United States of America joined in the World War II after 7th of December, 1941; the day on which it's Pearl Harbor was attacked. Prior to this America had stayed away from the war and wasn't a part of either the Allied or the Axis powers. However, when Japan destroyed almost the entire American navy with a surprise bombing of Pearl Harbor which was of its primary naval bases, the U.S joined in fighting along side France and Britain.
In World War 2 there were the Allies and the AxisAllied CountriesAt the start of the war the Allied nations were the United Kingdom and the Commonwealth nations, France and Poland but in 1939 Poland was annexed by Germany and in 1940 France fell to Germany, from 1940 to 1941 Britain and the Commonwealth fought the Axis powers alone.After the Japanese attack on Pearl Harbor and declaration of war by Germany, The United States of America joined the war on the side of the Allies in 1941.In 1941 the Soviet Union was invaded by Germany and the Soviet Union joined the with the Allies, (Should be noted that the Soviet Union only aligned itself with the Allies in the interest of defeating Germany the Axis forces, relations between the the Allies and the Soviet Union where dubious at best).Axis forcesFrom 1939 to 1945, Germany was the biggest and most powerful Axis member in Europe.Italy joined the war in 1940 on Axis side but swapped sides in 1943 to the Allies after Benito Mussolini was disposed. Japan was an Axis member since 1937 but only joined the war actively in 1941 with the attack on Pearl Harbor
The United States.
Prior to December 1941, France, Poland, and Great Britain were the primary allied forces. Canada, Australia, Newfoundland, New Zealand, South Africa, and joined them after 1939.
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MacArthur
When the US joined the war in 1941, they joined with the Allied Powers. Italy was a part of the Axis powers. They had to fight each other.
Great Britain controlled the Allied powers in 1941
Czechoslovakia was occupied by Germany on 15 March 1939. The government in exile joined the Allies on 16 December 1941.
Yes, Australia was one of the original Allied nations beginning in September 1939. The United States formally joined the Allied cause in December 1941, when the Japanese attacked the US (Dec 7, 1941) & then Germany declared war (Dec 11, 1941) on the US.
The United States joined the Allies in December 1941 .. HELP TO FIND THE OTHER COUNTRY
Basically when Germany invaded the Soviet Union on June 22nd, 1941.
There were more than 5 allied nations in WWII but the 5 main nations were Great Britain, China, France (was defeated by Germany in June 1940, but later joined with allies again), the Soviet Union (from June 1941) and the United States (from December 1941).
Spain, Portugal, Sweden, Switzerland