Re:Indiana Jones is totally irrelevant to the movie
Haven't seen the film in a long time, but didn't Indy get the plane which was to take the Ark back to Germany blown up? In which case it would've probably been opened up by top men there who would have been melted/immolated. So Indy probably increased the length of the war from his actions. (Actually thinking about the film was set before WW2, so he probably could of stopped it if he hadn't blown up the plane).