October 3, 1990: The German Democratic Republic (East Germany) acceded to the Federal Republic of Germany (West Germany), ending 45 years of division.
Post-WWII, Germany split into four occupation zones. Western zones merged into the FRG (1949); Soviet zone became the GDR (1949). The Berlin Wall fell Nov 9, 1989, catalyzing reunification talks. Treaty signed Aug 31, 1990; effective Oct 3.
National holiday with parades, concerts, fireworks, and reflection on Germany's journey from division to unity.