20 Years of EU Enlargement Free Movement of Workers and Social Security Coordination

Since its founding, the European Union (EU) has undergone several rounds of enlargement, expanding from the original six Member States to 27 today. This year marks the 20th anniversary of the European Union's fifth enlargement which took place in 2004. Two decades ago, citizens of ten Central and Eastern European (CEE) countries— Cyprus, Czechia, Estonia, Hungary, Latvia, Lithuania, Malta, Poland, Slovakia, and Slovenia— became part of the EU1.