# European Union Explained: Purpose, History, and Member Countries

![European Union: A political and economic alliance of 27 countries located primarily in Europe.](https://www.investopedia.com/thmb/-GFBHbI7j9SS9hwyLJ3Zvg7jFJw=/1500x0/filters:no_upscale():max_bytes(150000):strip_icc()/EuropeanUnion-final-ceea85e34a8b41f7a3721309c30bebe6.png)

*The EU grew out of a desire to strengthen economic and political cooperation throughout the continent of Europe in the wake of World War 11. — Zoe Hansen / Investopedia*

## What Is the European Union (EU)?

The European Union (EU) is a political and economic alliance of 27 countries, noted for promoting democratic values and supporting global trade. The EU grew out of a post-World War II coal and steel organization of six countries. Many of the current member countries use the [euro](https://www.investopedia.com/terms/e/euro.asp) as their common currency.

### Key Takeaways

*   The European Union (EU) is an economic and political alliance of 27 countries, promoting democratic values and major trade.
*   The EU traces its origins to the 1950 European Coal and Steel Community with just six members.
*   The euro is the official currency for 19 EU nations, collectively known as the eurozone.
*   In 2016, the U.K. voted to leave the EU in what became known as Brexit, officially exiting in 2020.
*   Over the years, the EU has expanded to include former socialist states from Eastern Europe after the collapse of the Soviet Union.

## The Origin and Development of the European Union 

The EU traces its roots to the European Coal and Steel Community, which was founded in 1950 and had just six members: Belgium, France, Germany, Italy, Luxembourg, and the Netherlands. In 1957, it became the European Economic Community under the Treaty of Rome and was later renamed the [European Community](https://www.investopedia.com/terms/e/european-community.asp) (EC).

This served to deepen the integration of the member nations' foreign, security, and internal affairs policies. The EU established a common market the same year to promote the free movement of goods, services, people, and capital across its internal borders.

Initially, the EC focused on a shared agricultural policy and removing [customs barriers](https://www.investopedia.com/terms/c/customs-barrier.asp). Denmark, Ireland, and the U.K. joined in 1973 in the first wave of expansion. In 1979, direct elections to the European Parliament began.

### Establishment of the EU Common Market 

The Single European Act of 1986 started a six-year plan to create a common market by harmonizing regulations.

The [Maastricht Treaty](https://www.investopedia.com/terms/m/maastricht-treaty.asp) took effect in 1993, replacing the EC with the EU. The euro debuted as a common single currency for participating EU members on Jan. 1, 1999. Denmark and the U.K. negotiated "opt-out" provisions that permitted countries to retain their own currencies if they chose.

Several newer members of the EU have also either not yet met the criteria for adopting the euro or chosen to opt out.

## Navigating the European Debt Crisis 

In the wake of the 2007-2008 global financial crisis, the EU and the [European Central Bank](https://www.investopedia.com/terms/e/europeancentralbank.asp) struggled to deal with high sovereign debt and sluggish growth in Italy, Spain, Portugal, Ireland, and Greece.

Greece and Ireland received financial bailouts from the EU in 2010 conditioned on the implementation of fiscal [austerity](https://www.investopedia.com/terms/a/austerity.asp) measures. Portugal followed in 2011. A second Greek bailout was needed in 2012.

The crisis eased after the EU and European Central Bank adopted measures to support sovereign and banking debts.

### Long-Term Financial Strategies of the EU

These included the establishment in October 2012 of the European Stability Mechanism (ESM), established to assist EU members experiencing severe financial problems, including an inability to access the bond markets. The ESM supplanted the temporary European Financial Stability Facility backstop in place since 2010.

The European Central Bank conducted a series of "targeted longer-term refinancing operations" in 2014, 2016, and 2019 to provide financing on favorable terms for EU financial institutions.

In 2015, the EU loosened the provisions of the 2011 Stability and Growth Act requiring member states to target public debt of below 60% of gross domestic product and annual government budget deficits below 3% of GDP over the medium term.

The same year, a new EU agency, the Single Resolution Board, assumed responsibility for resolving bank failures in the euro area.  

## Addressing Economic Disparities in the EU 

While the relief measures addressed the crisis, they haven't tackled one of its principal causes—the wide disparity in wealth and economic growth between the EU's heavily industrialized north and its poorer southern periphery, which remains less urbanized and more dependent on agriculture.  

Since they share a currency, southern economies can't use [currency depreciation](https://www.investopedia.com/terms/c/currency-depreciation.asp) to boost competitiveness. Without currency depreciation, southern exporters ultimately struggle to compete with their northern rivals, which benefit from faster productivity growth.

### U.S. Strategies for Managing Regional Economic Disparities

In the U.S., federal [transfer payments](https://www.investopedia.com/terms/t/transferpayment.asp) help to address similar economic disparities between regions and states. States with higher average incomes tend to contribute a disproportionately large share of federal revenue, while those with lower incomes tend to account for a higher share of federal outlays.

In the EU, the COVID-19 pandemic prompted joint spending measures some have called "an incomplete and fragile fiscal union in the making."

## The Implications of Brexit for the European Union 

After rejecting earlier calls for a popular referendum on the U.K.'s EU membership, Conservative Prime Minister David Cameron promised a vote in 2013 and scheduled it in 2016. It was a time of growing popularity for the U.K. Independence Party, which opposed EU membership.

After trailing in late polls, the [Leave option won](https://www.investopedia.com/terms/b/brexit.asp) with nearly 52% of the vote on June 23, 2016. Cameron resigned the next day. The U.K. officially left the EU on Jan. 31, 2020.

In July 2020, a report by the Intelligence and Security Committee of the U.K. Parliament noted widespread media reports of Russian efforts on behalf of the Leave option and faulted the government for failing to investigate Russian involvement in British politics.  

## What Is the Purpose of the European Union?

The European Union was created to bind the nations of Europe closer together for the economic, social, and security welfare of all. It is one of several efforts after World War II to bind together the nations of Europe into a single entity.

## How Is the European Union Changing in the 21st Century?

The original members of the European Union were the nations of Western Europe. In the 21st century, the EU has expand membership to the Eastern European nations that emerged after the collapse of the Soviet Union. Current members include Bulgaria, Croatia, the Czech Republic, and others from Eastern Europe.

## Why Was the European Union Created?

The overarching purpose of the European Union, in the years after World War II, was to put an end to the devastating wars that had wracked Europe for centuries. At the same time, it became increasingly clear that a united Europe would have far greater economic and political power than the individual nations in the post-war world.

## The Bottom Line

The EU is a powerful alliance of 27 European countries that promotes democratic values among its members. It serves to faciliate political and economic integration throughout the region. Many, though not all, of its members share the euro as their official currency. Historically, it was made up primarily of the nations of Western Europe; it has since expanded to include member nations that had previously been socialist states prior to the collapse of the USSR. In 2020, the U.K. officially left the EU.

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