Expansion will create conflicts of interest between members.  Continuing expansion will mean a dilution of common national interests between the member states. National interests are to a large extent based upon geography and the economy. The EU-15 could be said to have both a unity of purpose; preventing another war between France and Germany as well as similar cultures, similar levels of wealth, and even a similarity in social policy. This has meant that the EU-15 member states had a lot of common interests so could agree to continuing integration. Newer member states have very different post World War II national experiences, shaped in particular by communist occupation. This makes many new EU members less willing to share sovereignty or contemplate the Union deepening. Moreover as the European Union gets bigger and more geographically diverse other interests diverge. For example some countries such as Germany are already inclined to conciliate Russia while others have been much more outspoken. This was particularly highlighted during Russia’s conflict with Georgia in 2008 where Poland strongly supported Georgia. [1]  [1] Andrew Curry, ‘Old Europe vs. New Europe Will Poland Split EU over Russia Policy?’, Spiegel Online, 14 August 2008,