Which feature distinguishes the EU from other regional organizations?

The feature that distinguishes the European Union (EU) from other regional organizations is the establishment of a political union. The EU goes beyond mere economic collaboration, such as that found in a customs union, by integrating aspects of political governance and legislation among member states. This political dimension allows for common policies in areas like trade, environment, and security, fostering deeper integration than is typical in other regional organizations.

While the EU does create a customs union, this aspect is common to various regional trading agreements and does not set the EU apart on its own. Similarly, programs that promote cultural heritage and antitrust loans or a unified energy policy may exist in other regional contexts but do not encapsulate the unique characteristic of political union found within the EU framework. This political integration is key to the EU's identity, helping to create a single market and a cohesive regional identity that aligns member states with shared governance objectives.