Antanas Smetona assumes power in Lithuania as the 1926 coup d'état is successful.

Antanas Smetona was a Lithuanian intellectual, journalist and politician. He served as the first president of Lithuania from 1919 to 1920 and later as the authoritarian head of state from 1926 until the Soviet occupation of Lithuania in 1940. Referred to as the "Leader of the Nation" during his presidency, Smetona is recognised as one of the most important Lithuanian political figures between World War I and World War II, and a prominent ideologist of Lithuanian nationalism and the movement for national revival.

Lithuania, officially the Republic of Lithuania, is a country in the Baltic region of Europe. It is one of three Baltic states and lies on the eastern shore of the Baltic Sea, bordered by Latvia to the north, Belarus to the east and south, Poland to the south, and the Russian semi-exclave of Kaliningrad Oblast to the southwest, with a maritime border with Sweden to the west. Lithuania covers an area of 65,300 km² (25,200 sq mi), with a population of 2.9 million. Its capital and largest city is Vilnius; other major cities include Kaunas, Klaipėda, Šiauliai and Panevėžys. Lithuanians are the titular nation, belong to the ethnolinguistic group of Balts, and speak Lithuanian.

The 1926 Lithuanian coup d'état was a military coup d'état in Lithuania that replaced the democratically elected government with a authoritarian regime led by Antanas Smetona. The coup took place on 17 December 1926 and was largely organized by the military; Smetona's role remains the subject of debate. The coup brought the Lithuanian Nationalist Union, the most conservative party at the time, to power. Previously it had been a fairly new and insignificant nationalistic party. By 1926, its membership reached about 2,000 and it had won only three seats in the parliamentary elections. The Lithuanian Christian Democratic Party, the largest party in the Seimas at the time, collaborated with the military and provided constitutional legitimacy to the coup, but accepted no major posts in the new government and withdrew in May 1927. After the military handed power over to the civilian government, it ceased playing a direct role in political life.