People's Republic of Bulgaria in the context of "Socialist Federal Republic of Yugoslavia"

The revolutions of 1989, also known as the fall of communism, were a wave of liberal democratic movements that resulted in the collapse of most Marxist–Leninist governments in the Eastern Bloc and other parts of the world. This wave is sometimes referred to as the "autumn of nations", in reference to the revolutions of 1848 as the "spring of nations". The revolutions of 1989 were a key factor in the dissolution of the Soviet Union—one of the two superpowers—and abandonment of communist regimes in many parts of the world, some of which were violently overthrown. These events drastically altered the world's balance of power, marking the end of the Cold War and beginning of the post-Cold War era.

The earliest recorded protests, which led to the revolutions, began in Poland on 14 August 1980, the massive general strike which led to the August Agreements and establishment of Solidarity, the first and only independent trade union in the Eastern Bloc, whose peak membership reached 10 million. The main region of the 1989 revolutions was Central Europe, starting in Poland with the 1988 Polish strikes, and continued in Hungary, East Germany, Bulgaria, Czechoslovakia, and Romania. On 4 June 1989, Poland conducted the first elections that led to the dissolution of the communist government, with Solidarity winning an overwhelming victory, leading to the peaceful fall of communism in Poland. Influenced by Poland, Hungary organised round table-format talks and began dismantling its section of the Iron Curtain. In August 1989, over a quarter of the Baltic states population physically chained for 675 kilometres (419 mi) in the Baltic Way protesting the occupation by the Soviet Union, while the opening of a border gate between Austria and Hungary set in motion a peaceful chain reaction, in which the Eastern Bloc disintegrated. This led to mass demonstrations in cities of East Germany and the fall of the Berlin Wall in November 1989, which served as the symbolic gateway to German reunification in 1990. A feature common to these developments was the extensive use of campaigns of civil resistance, demonstrating popular opposition to the continuation of one-party rule and contributing to pressure for change. Romania was the only country in which citizens and opposition forces used violence to overthrow its communist regime, although Romania was politically isolated from the rest of the Eastern Bloc.

The Socialist Republic of Macedonia (Macedonian: Социјалистичка Република Македонија, romanized: Socijalistička Republika Makedonija), or SR Macedonia, commonly referred to as Socialist Macedonia, Yugoslav Macedonia or simply Macedonia, was one of the six constituent republics of the post-World War II Socialist Federal Republic of Yugoslavia, and a nation state of the Macedonians. After the transition of the political system to parliamentary democracy in 1990, the Republic changed its official name to Republic of Macedonia in 1991, and with the beginning of the breakup of Yugoslavia, it declared itself an independent country and held a referendum on 8 September 1991 on which a sovereign and independent state of Macedonia, with a right to enter into any alliance with sovereign states of Yugoslavia was approved.

Geographically, SR Macedonia bordered Albania to the west, Greece to the south and Bulgaria to the east. Within Yugoslavia, it bordered SR Serbia (including SAP Kosovo) to the north. It was one of the two landlocked federal republics, along with SR Serbia.

The Paris Peace Treaties (French: Traités de Paris) were signed on 10 February 1947 following the end of World War II in 1945. The Paris Peace Conference lasted from 29 July until 15 October 1946. The victorious wartime Allied powers (principally the United Kingdom, Soviet Union, United States, and France) negotiated the details of peace treaties with those former Axis allies, namely Italy, Romania, Hungary, Bulgaria, and Finland, of which all but Hungary had switched sides and declared war on Germany during the war. They were allowed to fully resume their responsibilities as sovereign states in international affairs and to qualify for membership in the United Nations.

The settlement elaborated in the peace treaties included payment of war reparations, commitment to minority rights, and territorial adjustments including the end of the Italian colonial empire in North Africa, East Africa, Yugoslavia, Greece, and Albania, as well as changes to the Italian–Yugoslav, Hungarian–Czechoslovak, Soviet–Romanian, Hungarian–Romanian, French–Italian, and Soviet–Finnish borders. The treaties also obliged the various states to hand over accused war criminals to the Allied powers for war crimes trials.

The Socialist Republic of Romania (Romanian: Republica Socialistă România, RSR) was a communist state that existed officially in Romania from 1947 to 1989 (see Revolutions of 1989). From 1947 to 1965, the state was known as the Romanian People's Republic (Republica Populară Romînă, RPR). The country was an Eastern Bloc state and a member of the Warsaw Pact with a dominant role for the Romanian Communist Party enshrined in its constitutions. Geographically, RSR was bordered by the Black Sea to the east, the Soviet Union (via the Ukrainian and Moldavian SSRs) to the north and east, Hungary and Yugoslavia (via SR Serbia) to the west, and Bulgaria to the south.

As World War II ended, Romania, a former Axis member which had overthrown their pro-Axis government, was occupied by the Soviet Union as the sole representative of the Allies. On 6 March 1945, after mass demonstrations by communist sympathizers and political pressure from the Soviet representative of the Allied Control Commission, a new pro-Soviet government that included members of the previously outlawed Romanian Workers' Party was installed. Gradually, more members of the Workers' Party and communist-aligned parties gained control of the administration and pre-war political leaders were steadily eliminated from political life. In December 1947, King Michael I was forced to abdicate and the People's Republic of Romania was declared.

The Eastern Bloc, also known as the Communist Bloc (Combloc), the Socialist Bloc, the Workers Bloc, and the Soviet Bloc, was an unofficial coalition of Communist states of Central and Eastern Europe, Asia, Africa, and Latin America that were aligned with the Soviet Union and existed during the Cold War (1947–1991). These states followed the ideology of Marxism–Leninism and various types of socialism, in opposition to the capitalist Western Bloc. The Eastern Bloc was often called the "Second World", whereas the term "First World" referred to the Western Bloc and "Third World" referred to the non-aligned countries that were mainly in Africa, Asia, and Latin America but notably also included former pre-1948 Soviet ally Yugoslavia, which was located in Europe.

In Western Europe, the term Eastern Bloc generally referred to the USSR and Central and Eastern European countries in the Comecon (East Germany, Poland, Czechoslovakia, Hungary, Romania, Bulgaria, and Albania). In Asia, the Eastern Bloc comprised Mongolia, Vietnam, Laos, Kampuchea, North Korea, South Yemen and China. In the Americas, the countries aligned with the Soviet Union included Cuba from 1961 and for limited periods Nicaragua and Grenada.

State atheism is the incorporation of hard atheism or non-theism into political regimes. It is considered the opposite of theocracy and may also refer to large-scale secularization attempts by governments. To some extent, it is a religion-state relationship that is usually ideologically linked to irreligion and the promotion of irreligion or atheism. State atheism may refer to a government's promotion of anti-clericalism, which opposes religious institutional power and influence in all aspects of public and political life, including the involvement of religion in the everyday life of the citizen. In some instances, religious symbols and public practices that were once held by religions were replaced with secularized versions of them. State atheism in these cases is considered as not being politically neutral toward religion, and therefore it is often considered non-secular.

The majority of communist states followed similar policies from 1917 onwards. The Soviet Union (1922–1991) had a long history of state atheism, whereby those who were seeking social success generally had to profess atheism and stay away from places of worship; this trend became especially militant during the middle of the Stalinist era, which lasted from 1929 to 1953. In Eastern Europe, countries like Bulgaria, East Germany and Czechoslovakia experienced strong state atheism policies. The Soviet Union attempted to suppress public religious expression over wide areas of its influence, including places such as Central Asia. Currently, China, North Korea, and Vietnam, are officially atheist.

Urban-type settlement is an official designation for lesser urbanized settlements, used in several Central and Eastern European countries. The term was primarily used in the Soviet Union and later also for a short time in socialist Bulgaria and socialist Poland. It remains in use today in nine of the post-Soviet states.

The designation was used in all 15 member republics of the Soviet Union from 1922. It was introduced later in Poland (1954) and Bulgaria (1964). All the urban-type settlements in Poland were transformed into other types of settlement (town or village) in 1972. In Bulgaria and five of the post-Soviet republics (Armenia, Moldova, and the three Baltic states), they were changed in the early 1990s, while Ukraine followed suit in 2023. Today, this term is still used in the other nine post-Soviet republics – Azerbaijan, Belarus, Georgia, Kazakhstan, Kyrgyzstan, Russia, Tajikistan, Turkmenistan, Uzbekistan. It is also used in Transnistria, an unrecognised breakaway state in Moldova.