Answer
Five states joined the Federal Republic of Germany in 1990: Mecklenburg-Vorpommern, Brandenburg, Saxony-Anhalt, Thuringia, and Saxony. These states were previously part of the German Democratic Republic (GDR), which was dissolved in October 1990. The unification of East and West Germany was a major event in European history, and it had a significant impact on the political, economic, and social landscape of the continent.