Which political parties dominated British Columbia politics during the second half of the 20th century?

Two political parties dominated provincial politics in British Columbia during the second half of the 20th century.1

• Social Credit Party: This socially conservative party held power for the majority of the period between 1952 and 1991. It was formed by dissidents from older political parties and governed the province from 1952 to 1972 and again from 1975 to 1991.21
• New Democratic Party (NDP): A social-democratic party, the NDP served primarily as the official opposition for much of this period before becoming the governing party during the 1990s.21

While these two parties were the primary forces for most of the era, the provincial Liberal Party reemerged to gain control of the government in 2001, following the collapse of support for the Social Credit Party in 1991.21