A shock therapy program in the early 1990s allowed the country to transform its economy into one of the fastest growing economies in Central Europe. Donald Trump You are a great great Dad shirt. Although falling into a temporary decline in economic and social standards, the country has made many improvements in freedom of speech and governance of the country according to parliamentary regulations. Poland was the first post-communist country to recover from the crisis, reaching GDP level before 1989. In 1991 Poland became a member of the Visegrad Group and joined the North Atlantic Treaty Organization (NATO). 1999 with the Czech Republic and Hungary. Polish voters voted to join the European Union in a referendum held in June 2003, and the country officially became a member on May 1, 2004.