The Big 4 usually means the US, Britain, USSR and either France or China, depending on your viewpoint.
Other combatants on the "Allied" side (with their dates of entering the war) included:
Polish 1 September 1939
Canada 10 September 1939
Australia 3 September 1939
India 3 September 1939
Yugoslavia 6 April 1941
Greece 28 October 1940
Netherlands 10 May 1940
Belgium 10 May 1940
New Zealand 3 September 1939
Union of South Africa 3 September 1939
Norway 8 April 1940
Denmark April 1940
Luxembourg 10 May 1940
Czechoslovakia 16 December 1941
Korea 10 December 1941
Ethiopia 14 December 1942
Brazil 22 August 1942
Mexico 22 May 1942
Cuba 9 December 1941
The Philippines 8 December 1941
Mongolia 8 December 1941
Nepal 4 September 1939
Panama 7 December 1941
Costa Rica 8 December 1941
Dominican Republic 8 December 1941
El Salvador 8 December 1941
Haiti 8 December 1941
Honduras 8 December 1941
Nicaragua 8 December 1941
Guatemala 9 December 1941
Iraq 16 January 1943
Colombia 26 July 1943
Iran 9 September 1943
Liberia 27 January 1944
Peru 12 February 1944
Romania 25 August 1944
Bulgaria 8 September 1944
Hungary 20 January 1945
Ecuador 2 February 1945
Paraguay 7February 1945
Uruguay 15 February 1945
Venezuela 15 February 1945
Turkey 23 February 1945
Egypt 24 February 1945
Syria 26 February 1945
Lebanon 27 February 1945
Saudi Arabia 1 March 1945
Finland 3March 1945
Argentina 27 March 1945
Chile 11 April 1945 (at war only with Japan)
The Last Days of World War II - 2005 February 25-March 3 The Allies Advance 1-2 was released on: USA: 25 February 2005
League of Nations - 1920 was released on: USA: October 1920
The Battle of the Nations - 1914 was released on: USA: 21 November 1914
Lacrosse the Nations - 2009 was released on: USA: April 2009 (internet)
League of Nations - 1924 was released on: USA: 15 October 1924
How to Dig a Hole to the Other Side of the World - 1980 was released on: USA: 1980
Daniel Boone - 1964 The Allies 5-22 was released on: USA: 27 March 1969
Beware the Batman - 2013 Allies 1-8 was released on: USA: 14 September 2013
Character - 2012 Allies and Enemies 2-11 was released on: USA: 6 August 2013
An Ensign to the Nations - 1997 TV was released on: USA: October 1997
Ballet des nations - 1903 was released on: USA: October 1903
There are two dates said to be the end dates of world war two. First date is August 14, 1945 and other is September 2, 1945 both dates are the dates when Japan surrendered.