17 of the 27 members of the European Union use the Euro, so it could not really be said the EU is united under the Euro.
Switzerland is not in the EU, so it cannot join the Euro area.
Great Britain. Not true, the United Kingdom does not regret joining the Euro.
It has united the europeon nations making their dollars stronger.
Several countries in the European Union have not adopted the euro as their official currency. Notably, Denmark has maintained its own currency, the Danish krone, through an opt-out clause. Other EU members like Sweden and Poland have also not yet transitioned to the euro, despite being obligated to do so under their EU accession agreements. Additionally, some non-EU countries, such as the United Kingdom before Brexit, have also opted to retain their own currencies.
It started as "free trade" under the EU. Then it became the government . . . somehow.
Actually, all countries that use the euro are part of the European Union (EU), as the euro is the official currency of EU member states. However, there are countries like Kosovo and Montenegro that use the euro without being EU members. These countries have unilaterally adopted the euro for practical reasons, but they do not have the same rights and obligations as EU member states. Thus, while all eurozone countries are EU members, some regions or territories may use the euro outside of EU membership.
Euro
euro
Montenegro and Kosovo are countries that are not in the EU but use the Euro (Kosovo also uses the Serbian Dinar)
The EU is just the European Union. Any countries of Europe can apply to receive EU membership if they qualify. The EU (or Euro) zone is the collection of member countries which share the currency the Euro. The Euro is now compulsory for all EU members, except the UK and Denmark which have opted out but may join in the future.
Denmark did not leave the EU. It is still a member. It does not use the Euro, but that does not mean it is not in the EU. Some other EU countries do not use the Euro. Only 19 of the 28 member countries use it.
The euro is the current Italian currency. Italy is a member of the European Union. Use of the euro isn't a requirement of EU membership. For example, Sweden is an EU member that doesn't use the euro. Italy is an example of an EU member that does.