Any country who wanted to be a part of the war had to pick which side it wanted to be on and then they declared war on the enemy. See list below for who did participate in World War 2.
Allies (Leaders)
Ethiopia · China · Czechoslovakia · Poland · United Kingdom · India · France · Australia · New Zealand · South Africa · Canada · Norway · Belgium · Netherlands · Egypt · Greece · Yugoslavia · Soviet Union · United States · Philippines · Mexico · Brazil
Axis and
Axis-aligned
(Leaders)
Italy · Japan · Germany · Slovakia · Bulgaria · Croatia · Finland · Hungary · Romania · Thailand · Manchukuo · Italian Social Republic · Iraq
Resistance
Austria · Baltic States · Belgium · Czech lands · Denmark · Estonia · Ethiopia · France · Germany · Greece · Italy · Jewish · Korea · Latvia · Netherlands · Norway · Philippines · Poland · Thailand · Soviet Union · Slovakia · Western Ukraine · Vietnam · Yugoslavia
'Allowed' is a curious word to use of a war.
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what countries had world war 2 in democry
it allowed India to gain strength because after world war 2 it weakened the european countries economic which allowed india to rise in nationlism .
No, there have been many civil wars in various countries around the world, but World War 2 was not a civil war.
japan and germany where the two main countries in ww2
I only know one which is Brazil