Budapest (Hungarian: [ˈbudɒpɛʃt]) is the capital and the largest city of Hungary, and one of the largest cities in the European Union. It is the country's principal political, cultural, commercial, industrial, and transportation centre, sometimes described as the primate city of Hungary. According to the census, in 2011 Budapest had 1.74 million inhabitants, down from its 1989 peak of 2.1 million due to suburbanisation. The Budapest Metropolitan Area is home to 3.3 million people. The city covers an area of 525 square kilometres (203 sq mi). Budapest became a single city occupying both banks of the river Danube with the unification of Buda and Óbuda on the west bank, with Pest on the east bank on 17 November 1873.
On 23 October 1956 citizens held a large peaceful demonstration in Budapest demanding democratic reform. The demonstrators went to the Budapest radio station and demanded to publish their demands. The regime ordered troops to shoot into the crowd. Hungarian soldiers gave rifles to the demonstrators who were now able to capture the building. This initiated the Hungarian Revolution of 1956. The demonstrators demanded to appoint Imre Nagy to be Prime Minister of Hungary. To their surprise, the central committee of the "Hungarian Working People's Party" did so that same evening. This uprising was an anti-Soviet revolt that lasted from 23 October until 11 November. After Nagy had declared that Hungary was to leave the Warsaw Pact and become neutral, Soviet tanks and troops entered the country to crush the revolt. Fighting continued until mid November, leaving more than 3000 dead. A monument was erected at the fiftieth anniversary of the revolt in 2006, at the edge of the City Park. Its shape is a wedge with a 56 angle degree made in rusted iron that gradually becomes shiny, ending in an intersection to symbolize Hungarian forces that temporarily eradicated the Communist leadership
More information on the Wikipedia page [https://en.wikipedia.org/wiki/Budapest#Contemporary_history_after_Unification