Short answers, pulled from the story.
The first Soviet Ukrainian government was declared on the 24th of December 1917 in Kharkov. The formal Ukrainian Soviet Socialist Republic was constituted when the Third All-Ukrainian Congress of Soviets ratified its constitution on the 10th of March 1919 in Kharkiv, and it became a founding member of the USSR on the 30th of December 1922.
Estimates of direct deaths from the Holodomor, the famine of 1932-1933, range from 2.6 million to 10 million. The famine resulted from Soviet policies including compulsory grain requisitions, forced collectivization, dekulakization, and Russification, according to the International Commission of Inquiry Into the 1932-1933 Famine in Ukraine, which concluded its findings in 1990.
The Ukrainian SSR became a founding member of the United Nations on the 24th of October 1945, alongside the Soviet Union and the Byelorussian SSR, as part of a deal with the United States to create a degree of balance in the General Assembly. In practice, this gave the Soviet Union additional votes in the General Assembly. The Ukrainian SSR served as an elected member of the UN Security Council in 1948-1949 and 1984-1985.
From 1919 until 1934, the city of Kharkov served as the capital of the Ukrainian SSR. In 1934 the seat of government was relocated to Kiev, the historic Ukrainian capital, where it remained for the rest of the republic's existence.
The Ukrainian SSR gained significant western territories through a series of wartime agreements. Eastern Galicia and Volhynia were annexed in 1939 following the Soviet invasion of Poland under the Molotov-Ribbentrop Pact. Significant portions of Romania were incorporated in 1940. Carpathian Ruthenia, formerly part of Czechoslovakia, was formally transferred to the Ukrainian SSR on the 29th of June 1945.
The Supreme Soviet of the Ukrainian SSR adopted the Declaration of Independence of Ukraine on the 24th of August 1991, following a proposal by deputy Ihor Yukhnovskyi. A nationwide referendum on the 1st of December 1991 confirmed independence with 92.3 percent of voters in favor, including majorities in every region of the country. The Soviet Union formally dissolved on the 26th of December 1991.