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The Molotov-Ribbentrop pact is signed. It officially was a pact of non-aggression between Germany and the USSR, (not an official alliance). A secret protocol divided Eastern Europe in Soviet and German spheres of influence.
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The USSR sends an ultimatum to Romania, demanding Romanian withdrawal from Bessarabia and northern Bukovina. Pressured by the Germans, Romanians accept. Most of the region is unified with the Moldovan ASSR to form the Moldovan SSR, although minor parts of both Bessarabia and the Moldovan ASSR are given to the Ukrainian SSR.
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Nazi Germany attacks the USSR. Romanian joins in on the Germans and retakes Bessarabia. Areas between the Dniester and Bug rivers are annexed by Romania and organized as the Transnistria Governorate.
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During the Dnieper–Carpathian Offensive, the Transnistria Governorate and most of Bessarabia are recaptured by the Soviets.
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During the Jassy-Kishinev (Iasi-Chisinau) offensives, Bessarabia is recaptured by the Soviets, and Romania joins the Allies, and signs a ceasefire with the USSR.
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Collectivization is implemented in Moldova
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The Destalinazation process allows deportees to return from the gulags.
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A National Patriotic Front is established by young intellectuals. Many members were arrested, after an informative note by the President of the Council of State Security of the Romanian Socialist Republic.
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Large amounts of money are spent for development in the Moldovan SSR
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The Supreme Soviet of the Moldovan SSR change the alphabet to the Latin one from the Cyrillic one.
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The Pridnestrovian Moldavian Soviet Socialist Republic is declared, hoping it would remain in the USSR, but it neither recognized by Moscow or Chisinau
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Moldova boycotts the referendum on whether to stay on the USSR, along with the Baltic states and Armenia. In May, Moldova changes its name to "Republic of Moldova".
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Gagauzia declares independence
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Moldova declares independence, after the dissolution of the USSR
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The situation in Transnistria escalates into war