Wie viele Bundesländer kamen bei der Wiedervereinigung 1990 zur Bundesrepublik Deutschland hinzu?How many federal states joined the Federal Republic of Germany during reunification in 1990?

Explanation

With reunification, the five re-established Länder Brandenburg, Mecklenburg-Vorpommern, Sachsen, Sachsen-Anhalt and Thüringen joined the Federal Republic. Berlin became a unified city-state but is not counted among these five because West Berlin was already linked to the FRG.