The 1977 Irish general election was held on Thursday, 16 June and is regarded as a pivotal point in twentieth-century Irish politics. Jack Lynch led Fianna Fáil to a landslide election win. The general election took place in 42 parliamentary constituencies throughout Ireland for 148 seats in the lower house of parliament, Dáil Éireann. Under the Electoral (Amendment) Act 1974, there were significant changes to constituency boundaries and the number of seats in the Dáil was increased by 4 from 144 to 148. The 21st Dáil assembled at Leinster House on 5 July, when a new Fianna Fáil government replaced the incumbent Fine Gael–Labour Party coalition. Jack Lynch became Taoiseach for the second time.