Why are there only five people in the European parliament, who support something like a Federal Europe or the United States of Europe, even tho there are still some more people in some European countries who support this Idea? And why are Pan-European partys , like Volt, diem25 and the European Federalist Party this smal?
the simplest answer is language and cultural barries which form some sense of individual nationalistic identity many (especially older) people are not ready to give up yet.
In addition to that, many states treat and market to their citizens the EU as a burden that just imposes strict regulations and gives money to the others (e.g. Greece). They obviously neglect to inform their citizens of all the positive stuff and profits we get from a strong Union. And, consequentually, popular politicians don’t see the EU as a higher stepping stone, if they are well established in their country. In the EU Parliament you mostly have lesser known local politicians and those, who the established local parties wanted to get rid of (in Brussels they are far away from any local government decision).