Freedom of movement for its citizens inside EU, moving from their local currency to the Euro and inflating the economy to keep up (this is also what Croatia did when they moved from the Croatian Kuna to the Euro), ensuring they have military might (the Serbo-Bosnian-Croat genocide was a lesson for everyone) which means lesser probability like other nations attacking them, more tourism due to freedom of movement, more investment by EU citizens in Bulgaria. Unfortunately, the benefits for smaller countries far outweigh the integrity or staying sovereign. View quoted note →