EU9, is now an essential part of the European Union (EU). This cluster joined the EU in its 3rd enlargement phase in 2004, bringing diversity and fresh perspectives into the Union's mix.

The members of EU9 include Malta, Estonia, Slovenia, Slovakia, Czech Republic, Hungary, Latvia, Lithuania, and Poland. These states each have made substantial contributions towards broadening the goals of the European Union.

Therefore, understanding the part these nations plays in the European Union is required for any study relating to European economics, politics, or international relations.

Right from their admission, the EU9 nations have contributed substantially towards shaping the policies of the European Union. Their geographical location gives important strategic edges, making them a crucial part of the EU's defense and security strategies.

Additionally, these countries have tremendously contributed to the European Union's economic and financial strength. The EU9's rapid economic growth and willing integration into the EU market has led to increased trade with other EU members.

The social contribution of the EU9 is also significant. These nations incorporate deep historical backgrounds, distinct cultural practices, and varied languages, thereby enhancing the diversity of the EU.

The inclusion of EU9 has also affected the internal politics within the EU. With their involvement, the power dynamics have altered, with new coalitions and alliances emerging.

In conclusion, the contributions played by the EU9 members are considerable. From economic influence to cultural richness, and from security strategies to check here political dynamics, EU9 has fortified the European Union's structure. As such, an in-depth understanding of the EU9 is essential to fully grasping the details of the European Union.