East Prussia is the name of the former most eastern Prussian province, which existed until 1945 and whose extent (regardless of historically slightly changing border courses) roughly corresponds to the historical landscape of Prussia. The name was first used in the second half of the 18th century, when, in addition to the Duchy of Prussia with its capital Königsberg, which had been promoted to a kingdom in 1701, other previously Polish territories in the west (for example, the so-called Prussia Royal Share with Warmia and Pomerania) were added to Brandenburg-Prussia and formed the new province of West Prussia.
Nowadays, the territory of the former Prussian province belongs mainly to Russia (Kaliningrad Oblast) and Poland (Warmia-Masuria Voivodeship). The former so-called Memelland (also Memelgebiet, lit. Klaipėdos kraštas) first became part of Lithuania in 1920 and again from 1945.
West Prussia is a historical region in present-day northern Poland. The region fell to Prussia as a result of the first partition of Poland-Lithuania in 1772 and received its name from the province of the same name formed by Frederick II in 1775, which also included parts of the historical landscapes of Greater Poland, Pomerania, Pomesania and Kulmerland. The Prussian province lasted in changing borders until the early 20th century. After World War I, parts fell to the Second Polish Republic, founded in 1918. The largest cities in West Prussia include Gdansk (Polish: Gdańsk, today Pomeranian Voivodeship), Elbląg (Polish: Elbląg, today Warmia-Masuria Voivodeship), and Thorn (Polish: Toruń, today Kujawsko-Pomeranian Voivodeship).
The German Empire was a state in Central Europe that existed from 1871 to 1945. The period from its founding until 1918 is called the German Empire, then followed the period of the Weimar Republic (1918/1919-1933) and the National Socialism (so-called Third Reich) from 1933 to 1945. 01.01.1871 is considered the day of the foundation of the German Reich.
Estonia is a country in north-eastern Europe and geographically it belongs to the Baltic States. The country is inhabited by about 1.3 million people and borders Latvia, Russia and the Baltic Sea. The most populated city and capital at the same time is Tallinn. Estonia has been independent since 1991 and is a member of the European Union.
Latvia is a Baltic state in the north-east of Europe and is home to about 1.9 million inhabitants. The capital of the country is Riga. The state borders in the west on the Baltic Sea and on the states of Lithuania, Estonia, Russia and Belarus. Latvia has been a member of the EU since 01.05.2004 and only became independent in the 19th century.