In 1993, many of the continent's nations agreed to unite, forming the European Union (EU) in a plan that transformed borders, eliminated border checkpoints when traveling by car between two countries, and created a common currency. The Maastricht Treaty truly opened up Europe, making travel easier while promoting peace and democracy. In 2012, the EU earned the Nobel Peace Prize.
There are currently 28 nations that are members of the EU: Austria, Belgium, Bulgaria, Croatia, Cyprus, Czech Republic, Denmark, Estonia, Finland, France, Germany, Greece, Hungary, Ireland, Italy, Latvia, Lithuania, Luxembourg, Malta, the Netherlands, Poland, Portugal, Romania, Slovakia, Slovenia, Spain, Sweden and the United Kingdom. (The latter is embroiled in Brexit, arguing for an exit from the union.)