With the accession of the GDR to the Federal Republic of Germany, the new federal states now also belong …

EDITORIAL LEARNING AID

Why is this answer correct?

With the accession of 1990, the new states became part of the Federal Republic and thus also part of the European Community, from which today's European Union emerged. The Warsaw Pact was dissolved in 1991, OPEC is an association of oil-producing countries, and a European Defence Community failed in 1954 and does not exist.

Accession in 1990 = new states in the FRG and the EU.

This translation and explanation are editorial learning aids. The official German wording and answer key govern the examination.