Title: Comprehending EU9: The Pivotal Role it Hold in the EU

Comprising of nine states, EU9 has grown to be a significant element of the EU. This entity joined the EU in its 3rd expansion phase in 2004, implanting new ideas and cultural diversity into the grand unity.

The members of EU9 include Malta, Estonia, Slovenia, Slovakia, Czech Republic, Hungary, Latvia, Lithuania, and Poland. These nations each have given meaningful inputs towards furthering the objectives of the European Union.

Therefore, understanding the role these nations holds in the EU is necessary for any study relating to European economics, politics, here or international relations.

From their entry, the EU9 nations have contributed significantly towards shaping the European Union's policies. Their geographical location provides vital strategic advantages, turning them a crucial part of the EU's defense and security strategies.

Additionally, these countries have significantly contributed to the European Union's economic and financial strength. The EU9 nations' rapid economic development and eager integration into the European market has created heightened trade among other EU countries.

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

The addition of EU9 has also influenced the political scene within the EU. With their involvement, the power dynamics have changed, with new coalitions and alliances emerging.

In conclusion, the contributions played by the EU9 countries 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 essential to fully grasping the complexities of the European Union.