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History

Supranational Governance and the Diffusion of Policy Ideas

Quick fact

The European Union can override national law in certain policy areas: its Court of Justice has ruled that EU law gets precedence over conflicting national legislation, meaning national judges must set aside their own country's statutes when they clash with EU rules.

Why this is interesting

You might think every country has the final say over its own laws. But in Europe, a single court ruling in Brussels can force a national government to change its rules on everything from data privacy to plastic packaging. How did that come to be?