France went into World War 1 because it had an alliance with Russia. When Germany declared war on Russia, France went to help its ally.
All those are correct.
Britain, France, Japan and Belgium.
Canada was an ally to Britain and the USA fighting Germany during the WW1
UK, Canada, Australia.
Here is the list UK,USSR,France,China,Poland,Canada, NewZealand,Norway,Australia,Netherlands, Greece,and Belgium
Great Britian, Soviet Union, France
Only while occupied when it was liberated, they became an ally until the end.
France and Poland ...before the war this may have been correct but if your talking before the U.S. joined the war and by biggest you mean providing Men & War material then I would have to say it was Canada.
The ANZACS fought with the UK during both wars, so any ally of Britain was an ally of Australia and New Zealand. (i.e United States, France, Canada etc)
France
russia, canada, france