Occupation of the Baltic states in the context of "Revolutions of 1989"

World War II or the Second World War (1 September 1939 – 2 September 1945) was a global conflict between two coalitions: the Allies and the Axis powers. Nearly all of the world's countries participated, with many nations mobilising all resources in pursuit of total war. Tanks and aircraft played major roles, enabling the strategic bombing of cities and delivery of the first and only nuclear weapons ever used in war. World War II is the deadliest conflict in history, causing the death of 70 to 85 million people, more than half of whom were civilians. Millions died in genocides, including the Holocaust, and by massacres, starvation, and disease. After the Allied victory, Germany, Austria, Japan, and Korea were occupied, and German and Japanese leaders were put on trial for war crimes.

The causes of World War II included unresolved tensions in the aftermath of World War I, the rise of fascism in Europe and militarism in Japan. Key events preceding the war included Japan's invasion of Manchuria in 1931, the Spanish Civil War, the outbreak of the Second Sino-Japanese War in 1937, and Germany's annexations of Austria and the Sudetenland. World War II is generally considered to have begun on 1 September 1939, when Nazi Germany, under Adolf Hitler, invaded Poland, after which the United Kingdom and France declared war on Germany. Poland was divided between Germany and the Soviet Union under the Molotov–Ribbentrop Pact. In 1940, the Soviet Union annexed the Baltic states and parts of Finland and Romania. After the fall of France in June 1940, the war continued mainly between Germany, now assisted by Fascist Italy, and the British Empire, with fighting in the Balkans, Mediterranean, and Middle East, the aerial Battle of Britain and the Blitz, and the naval Battle of the Atlantic. Through campaigns and treaties, Germany gained control of much of continental Europe and formed the Axis alliance with Italy, Japan, and other countries. In June 1941, Germany invaded the Soviet Union, opening the Eastern Front and initially making large territorial gains.

Estonia, officially the Republic of Estonia, is a country in Northern Europe. It is bordered to the north by the Gulf of Finland across from Finland, to the west by the Baltic Sea across from Sweden, to the south by Latvia, and to the east by Russia. The territory of Estonia consists of the mainland, the larger islands of Saaremaa and Hiiumaa, and over 2,300 other islands and islets on the east coast of the Baltic Sea. Its capital Tallinn and Tartu are the two largest urban areas. The Estonian language, of the Finnic family, is the official language and the first language of the majority of its population of nearly 1.4 million. Estonia is one of the least populous members of the European Union and NATO.

Present-day Estonia has been inhabited since at least 9,000 BC. The medieval indigenous population of Estonia was one of the last pagan civilisations in Europe to adopt Christianity following the Northern Crusades in the 13th century. After centuries of successive rule by the Teutonic Order, Denmark, Sweden, and the Russian Empire, a distinct Estonian national identity began to emerge in the mid-19th century. This culminated in the 1918 Estonian Declaration of Independence from the then-warring Russian and German empires. Democratic throughout most of the interwar period, Estonia declared neutrality at the outbreak of World War II, but the country was repeatedly invaded and occupied, and ultimately annexed into the USSR. Throughout the de facto Soviet occupation, from World War II until 1991, Estonia's de jure state continuity was preserved by diplomatic representatives and the government-in-exile. Following the 1988–90 "Singing Revolution" against Soviet rule, full independence was restored on 20 August 1991.

The Baltic Way (Lithuanian: Baltijos kelias; Latvian: Baltijas ceļš; Estonian: Balti kett) or Baltic Chain (also "Chain of Freedom") was a peaceful political demonstration that occurred on 23 August 1989. Approximately two million people joined their hands to form a human chain spanning 675 kilometres (419 mi) across the three Baltic states of Estonia, Latvia, and Lithuania, with a combined population of around eight million citizens, who had been subjected to the Soviet Union's occupation and communist repression for more than 45 years, precisely speaking, between the Soviet Union's re-occupation of the Baltic states in 1944 (which took place alongside Soviet Union's Red Army's counteroffensive towards the west during the final years of World War II) and the Singing Revolution (a series of Baltic independence movements between 1987 and 1991), which culminated in Estonia, Latvia, and Lithuania's independence, that was achieved just before the dissolution of the Soviet Union in 1991. The central government in Moscow considered the three Baltic countries constituent republics of the Soviet Union.

The demonstration originated from "Black Ribbon Day" protests held in Western cities in the 1980s. It marked the 50th anniversary of the Molotov–Ribbentrop Pact, in which Poland, Finland, Estonia, Latvia, Lithuania, and Romania were (as "spheres of influence") divided between the Soviet Union and Nazi Germany. The Soviet-Nazi pact led to the outbreak of World War II in September 1939 and the Soviet invasion and occupation of the Baltic countries in June 1940.

The demographics of Estonia in the 21st century result from historical trends over more than a thousand years, as with most European countries, but have been disproportionately influenced by events in the second half of the 20th century. The Soviet occupation (1944–1991), extensive immigration from Russia and other parts of the former USSR, and the eventual restoration of independence of Estonia, have all had a major effect on Estonia's current ethnic makeup. The influx was largely due to the country's troubled demographics and continued need for labour. After its independence, Estonia continued to bring in the needed labour power from the same countries as it did during the Soviet times.

The languages spoken in Estonia largely reflect the composition of the indigenous and immigrant ethnic groups residing in Estonia, and thus have changed with historical trends affecting the ethnic makeup of the country. Similarly to other northern European peoples, religion plays a rather small part in the lives of most Estonians.

The Baltic offensive, also known as the Baltic strategic offensive, was the military campaign between the northern Fronts of the Red Army and the German Army Group North in the Baltic States during the autumn of 1944. The result of the series of battles was the isolation and encirclement of the Army Group North in the Courland Pocket and Soviet re-occupation of the Baltic States. In Soviet propaganda, this offensive was listed as one of Stalin's ten blows.

The Estonian Soviet Socialist Republic (abbreviated Estonian SSR, Soviet Estonia, or simply Estonia [ˈeˑstʲi] ) was an administrative subunit (union republic) of the former Soviet Union (USSR), covering the occupied and annexed territory of Estonia in 1940–1941 and 1944–1991. The Estonian SSR was nominally established to replace the until then independent Republic of Estonia on 21 July 1940, a month after the 16–17 June 1940 Soviet military invasion and occupation of the country during World War II. After the installation of a Stalinist government which, backed by the occupying Soviet Red Army, declared Estonia a Soviet constituency, the Estonian SSR was subsequently incorporated into the Soviet Union as a union republic on 6 August 1940. Estonia was occupied by Nazi Germany in 1941, and administered as a part of Reichskommissariat Ostland until it was reconquered by the USSR in 1944.

The majority of the world's countries did not recognise the incorporation of Estonia into the Soviet Union de jure and only recognised its Soviet administration de facto or not at all. A number of countries continued to recognise Estonian diplomats and consuls who still functioned in the name of their former government. This policy of non-recognition gave rise to the principle of legal continuity, which held that de jure, Estonia remained an independent state under occupation throughout the period 1940–1991.