section_path: History/20th century/Social safety net
section_name: Social safety net
paragraph_text: Social safety net
  
  In the period just before and after the Second World War, the party became a champion of 'progressive social policy'. As prime minister for most of the time between 1921 and 1948, King introduced several measures that led to the creation of Canada's social safety net. Bowing to popular pressure, he introduced the mother's allowance, a monthly payment to all mothers with young children. He also reluctantly introduced old age pensions when J. S. Woodsworth required it in exchange for his Co-operative Commonwealth Federation party's support of King's minority government.
  
  Louis St. Laurent succeeded King as Liberal leader on August 7, 1948 and as prime minister on November 15, 1948. In the 1949 and 1953 federal elections, St. Laurent led the Liberal Party to two large majority governments. As prime minister he oversaw the joining of Newfoundland in Confederation as Canada's tenth province, he established equalization payments to the provinces, and continued with social reform with improvements in pensions and health insurance. In 1956, Canada played an important role in resolving the Suez Crisis, and contributed to the United Nations force in the Korean War. Canada enjoyed economic prosperity during St. Laurent's premiership and wartime debts were paid off. The Pipeline Debate proved the Liberal Party's undoing. Their attempt to pass legislation to build a natural gas pipeline from Alberta to central Canada was met with fierce disagreement in the House of Commons. In 1957, John Diefenbaker 's Progressive Conservatives won a minority government and St. Laurent resigned as prime minister and Liberal leader.
  
  Lester B. Pearson was easily elected Liberal leader at the party's 1958 leadership convention. However, only months after becoming Liberal leader, Pearson led the party into the 1958 federal election that saw Diefenbaker's Progressive Conservatives win the largest majority government, by percentage of seats, in Canadian history. The Progressive Conservatives won 208 of the 265 seats in the House of Commons, while the Liberals were reduced to just 48 seats. Pearson remained Liberal leader during this time and in the 1962 election managed to reduce Diefenbaker to a minority government. In the 1963 election Pearson led the Liberal Party back to victory, forming a minority government. Pearson served as prime minister for five years, winning a second election in 1965. While Pearson's leadership was considered poor and the Liberal Party never held a majority of the seats in parliament during his premiership, he left office in 1968 with an impressive legacy. Pearson's government introduced Medicare, a new immigration act, the Canada Pension Plan, Canada Student Loans, the Canada Assistance Plan, and adopted the Maple Leaf as Canada's national flag.