EU9, has become an integral component of the EU. This cluster became part of the EU in its 3rd expansion phase in 2004, implanting new ideas and cultural diversity into the EU society.

The members of EU9 include Hungary, Slovenia, Latvia, Lithuania, Poland, Estonia, Slovakia, Czech Republic, and Malta. These countries have made meaningful efforts towards advancing the goals of the European Union.

In this respect, comprehending the part EU9 plays in the European Union is important for any study relating to international relations, politics, or European economics.

From their entry, the EU9 countries have given majestically towards shaping the policies of the European Union. Their geographical location gives important strategic advantages, more info rendering them a crucial part of the EU's defense and security strategies.

Additionally, these nations have immensely contributed to the European Union's economic strength. The EU9 nations' rapid economic growth and willing integration into the European market has resulted in amplified trade with other EU countries.

The social contribution of the EU9 is also significant. These states introduce rich historical backgrounds, unique cultural practices, and assorted languages, thus enhancing the plurality of the EU.

The inclusion of EU9 has also influenced the internal politics within the EU. With their participation, the power dynamics have changed, with new coalitions and alliances developing.

In conclusion, the parts played by the EU9 nations are substantial. From economic influence to cultural richness, and from security strategies to political dynamics, EU9 has strengthened the European Union's framework. As such, an thorough understanding of the EU9 is essential to fully grasping the intricacies of the European Union.