The Grand Alliance in London (13 Jan 1941)

Several European countries joined the Western Allies at different times during World War 2. In total 19 European countries joined the Allies from 1939 to 1945.The very first European countries to join the Allies and which were the original Allies were Poland, United Kingdom and France. The alliances between these three original allies pre-date WWII. After WWII other countries joined the Allies: Norway, Belgium, Luxembourg, The Netherlands (these four countries joined as "governments in exile"), Greece, Kingdom of Yugoslavia, Soviet Union and Czechoslovakia. Later on during the war other European countries joined the Western Allied Forces: Italy, Democratic Federal Yugoslavia, Romania, Bulgaria, San Marino, Albania, Hungary and Finland which was the last European country to join the Allies during the war in 1945 as co-belligerent.The USA joined the Western Allies in 1941 after the attack to Pearl Harbour.
The Grand Alliance in London (13 Jan 1941)
Allies-France, England, Wales, Scotland, Ireland, Denmark, Belgium, The Netherlands, Norway (Italy after 1944), Greece, Russia
Axis-Germany, Italy (Before 1944), Slovakia, Romania, Hungary, Bulgaria, Finland (Before 1944), Albania, Austria and the Czech Republic were dissolved into greater Germany

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