Before World Wars the Liberals constituted the political establishment that governed Italy for decades. They had their main bases in Piedmont, where many leading liberal politicians of the Kingdom of Sardinia and the Kingdom of Italy came from, and southern Italy. The Liberals never gained large support after World War II as they were not able to become a mass party and were replaced by Christian Democracy (DC) as the dominant political force. In the 1946 general election, the first after the war, the PLI gained 6.8% as part of the National Democratic Union. At that time they were strong especially in the South, as DC was mainly rooted in the North: 21.0% in Campania, 22.8% in Basilicata, 10.4% in Apulia, 12.8% in Calabria and 13.6% in Sicily.