Show answer and explanation
A to the European Union. zur Europäischen Union.
Why?
When the GDR joined the Federal Republic in 1990, the new eastern states automatically became part of the European Community, today's European Union. The Warsaw Pact was the former Eastern alliance and was dissolved in 1991.
Erklärung auf Deutsch
Mit dem Beitritt der DDR zur Bundesrepublik 1990 wurden die neuen Bundesländer automatisch Teil der Europäischen Gemeinschaft, der heutigen EU.
Remember: Join Germany = join the EU.