It gets a little confusing trying to work out who were "for us " and who were "against" us !! .... here's a list of neutral countries that were NOT a part of the war .... except for the notes attached !! Afghanistan - Did not support or oppose any nation. Argentina Colombia Denmark - Traded with both sides. El Salvador Ethiopia Luxembourg - Never declared war on the Central Powers despite being invaded and occupied by Germany. Mexico - Declined an alliance with Germany (see Zimmermann Telegram). Netherlands - An ally of the UK by treaty. Traded with both sides. Norway - Gave naval assistance to the UK. Paraguay Persia - Occupied by British and Russian troops. Spain - Also treaty bound ally to the UK. Sweden - Financially supported Germany. Switzerland - Switzerland did declare a "state of siege". Tibet Venezuela - Supplied the Allies with oil.
