Britain and France could have prevented WW2 from ever occurring at The Remilitarisation of the Rhineland, Munich Conference and The Invasion of Czechoslovakia. Britain and France could have also lowered reparations for Germany as Germany was bankrupt and with extremist parties taking power such as The Nazis would dislike the Allies and The Treaty of Versailles.
The major causes of WW2 were not the weaknesses of Britain and France as Czechoslovakia was too far away from Britain and France to help if the German Army invaded but Czechoslovakia would have been a very