If you like ad absurdum arguments: if you connect the countries together so much, they eventually decide to become one country and the chance of war goes down, not up (excluding civil war)
With all of these things, context matters. If memory serves, Austria being an independent state was one of the terms of the Treaty of Versailles, so if that had been the last act instead of the opening chapter, there still would have been hell to pay. Perhaps not on a par with Caesar crossing the Rubicon, but definitely starting something that requires a resolution.