In terms of geopolitical influence, the European Union is considered one of the most influential regional organizations in the world, with a combined GDP of around €15 trillion and a population of over 446 million people. The EU is also a major trading bloc, accounting for around 16% of global trade. The EU's political influence extends beyond Europe, with the organization playing a significant role in global diplomacy, peacekeeping, and human rights.

In terms of future prospects, the EU faces several challenges, including economic, political, and social issues. The economic challenges include Brexit, the debt crisis in Greece, and high levels of unemployment. The political challenges include rising nationalism, populism, and Euroscepticism in some member states, which threaten the unity of the EU. The social challenges include migration, demographic changes, and increasing social inequalities.

Compared to other such alliances/unions in history, it is difficult to make a direct comparison as the EU is a unique organization. However, the EU's economic and political influence is comparable to other major regional organizations such as NAFTA, ASEAN, and Mercosur. The EU's future prospects are also uncertain, but the organization has shown resilience in the face of previous challenges, and it remains a significant player on the global stage.
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