Eurozone Fast Facts

CNN Library

Updated 2151 GMT (0551 HKT) January 28, 2019

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The leaders of Germany and France, Angela Merkel and Francois Hollande, are struggling to keep the European Union -- and the euro -- together in the face of the eurozone crisis.

Photos: Why unity is so important to Europe

Why unity is so important to Europe – The leaders of Germany and France, Angela Merkel and Francois Hollande, are struggling to keep the European Union -- and the euro -- together in the face of the eurozone crisis.

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While the idea of European unity goes back centuries, today's EU has its foundations in the post-WWII years, when politicians were determined to prevent such conflict from breaking out again.

Photos: Why unity is so important to Europe

Why unity is so important to Europe – While the idea of European unity goes back centuries, today's EU has its foundations in the post-WWII years, when politicians were determined to prevent such conflict from breaking out again.

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French politician Robert Schuman is regarded as one of the founding fathers of the European Union -- he came up with the idea for its precursor, the European Coal and Steel Community.

Photos: Why unity is so important to Europe

Why unity is so important to Europe – French politician Robert Schuman is regarded as one of the founding fathers of the European Union -- he came up with the idea for its precursor, the European Coal and Steel Community.

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The ECSC, which came into being with the signing of the Treaty of Paris, on 18 April 1951, was designed to make war between France and Germany "not merely unthinkable, but materially impossible."

Photos: Why unity is so important to Europe

Why unity is so important to Europe – The ECSC, which came into being with the signing of the Treaty of Paris, on 18 April 1951, was designed to make war between France and Germany "not merely unthinkable, but materially impossible."

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The 1957 Treaty of Rome created the European Economic Community, under which the partner nations attempted to harmonize a raft of other policies, from agriculture and fisheries to monetary policy.

Photos: Why unity is so important to Europe

Why unity is so important to Europe – The 1957 Treaty of Rome created the European Economic Community, under which the partner nations attempted to harmonize a raft of other policies, from agriculture and fisheries to monetary policy.

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Over the decades, the EEC became the European Union, and expanded from the original six nations to today's 27 members, from Finland in the north to Malta in the south.

Photos: Why unity is so important to Europe

Why unity is so important to Europe – Over the decades, the EEC became the European Union, and expanded from the original six nations to today's 27 members, from Finland in the north to Malta in the south.

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Seventeen of the 27 EU members are also part of the eurozone, sharing the single European currency, the euro, which was launched on 1 January 1999. Euro coins and banknotes were introduced three years later.

Photos: Why unity is so important to Europe

Why unity is so important to Europe – Seventeen of the 27 EU members are also part of the eurozone, sharing the single European currency, the euro, which was launched on 1 January 1999. Euro coins and banknotes were introduced three years later.

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