EU9, has become an essential component of the European Union (EU). This group joined the EU in its 3rd expansion phase in 2004, implanting diversity and fresh perspectives into the EU society.

The EU9 nations include Hungary, Slovenia, Latvia, Lithuania, Poland, Estonia, Slovakia, Czech Republic, and Malta. These states each have given significant efforts towards advancing the aims of the European Union.

Therefore, knowing the responsibility these nations holds in the EU is important for any study relating to international relations, politics, or European economics.

Right from their admission, the states belonging to EU9 have contributed significantly towards shaping the European Union's policies. Their geographical location provides critical strategic advantages, making them a vital part of the EU's defense and security strategies.

Additionally, these nations have immensely contributed to the European Union's economic and financial strength. The EU9 nations' rapid economic growth and willing check here integration into the EU market has led to increased trade among other EU countries.

The social contribution of the EU9 is equally significant. These nations bring profound historical backgrounds, distinct cultural practices, and diverse 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 altered, with new coalitions and alliances emerging.

In conclusion, the parts played by the EU9 members are considerable. From economic influence to cultural richness, and from security strategies to political dynamics, EU9 has robustly augmented the European Union's framework. As such, an in-depth understanding of the EU9 is crucial to fully grasping the details of the European Union.