The history of Bulgaria during World War II encompasses an initial period of neutrality until 1 March 1941, a period of alliance with the Axis Powers until 8 September 1944, and a period of alignment with the Allies in the final year of the war.
The Red Army entered Bulgaria on 8 September 1944; Bulgaria declared war on Germany the next day.
As an ally of Nazi Germany, Bulgaria participated in the Holocaust, causing the deaths of 11,343 Jews, and though 48,000 Jews survived the war, they were subjected to forcible internal deportation, dispossession, and discrimination.
Tsar Boris III (reigned 1918–1943) ruled through a parliament and a prime minister. Bulgaria’s wartime government was pro-German under Georgi Kyoseivanov, Bogdan Filov, Dobri Bozhilov, and Ivan Bagryanov. It joined the Allies under Konstantin Muraviev in early September 1944, then underwent a coup d’état a week later, and under Kimon Georgiev was pro-Soviet thereafter.