With any pod after 1944, make it so that relations between the United States and the EU/EEA/European Bloc deteriorate as much as possible. Make it so that it gets so bad, that each side at the very least throws heavy sactions at each other. If you get can get it to the level of war, that would be good too. But how would we get this? I'm thinking a messier Suez crisis.
Maybe a weaker soviet union that gets far enough to defeat the Nazis but they end up occupying less territory than otl, so that countries that where part of the eastern bloc otl can be with western europe, thus providing more members to the EU or EU equivalent.