Until the 19th century, Romanian was usually written using a local variant of the Cyrillic alphabet. A variant based on the reformed Russian civil script, first introduced in the late 18th century, became widespread in Bessarabia after its annexation to the Russian Empire, while the rest of the Principality of Moldavia gradually switched to a Latin-based alphabet, adopted officially after its union with Wallachia that resulted in the creation of Romania. Grammars and dictionaries published in Bessarabia before 1917, both those that used the label "Moldovan" and the few that used "Romanian", used a version of the Cyrillic alphabet, with its use continuing in Bessarabia even after the 1918 union, in order to make the publications more accessible to peasant readers. The Moldovan Cyrillic alphabet was officially introduced in the early 1920s, in the Soviet bid to standardise the orthography of Romanian in the Moldavian ASSR; at the same time furthering political objectives by marking a clear distinction from the Latin-based Romanian orthography introduced in Romania in the 1860s. As was the case with other Cyrillic-based languages in the Soviet Union, such as Russian, Ukrainian or Belarusian, obsolete and redundant characters were dropped in an effort to simplify orthography and boost literacy. It was abandoned for a Latin-based alphabet during the Union-wide Latinisation campaign in 1932. Its re-introduction was decided by the Central Executive Committee of the Moldavian Autonomous Soviet Socialist Republic on May 19, 1938, albeit with an orthography more similar to standard Russian. Following the Soviet occupation of Bessarabia and Northern Bukovina, it was established as the official alphabet of the Moldavian Soviet Socialist Republic until 1989, when a law returned to the standard, Latin-based, Romanian alphabet.