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For a ranking of the nations, refer to the Related Link below.
See the list in the site Belligerents in World War 2 in the site in the separate panel Sources and related links below.
There are currently 192 member nations to the UN. A list of the current nations is filed under the related links.
There are over 200 so go to the related link to see a list of them
Afghanistan would be first.
An alphabetical list is in the Related Links section.