William Lyon Mackenzie King

Grandson of 1837 rebel William Lyon Mackenzie, King was trained in economics at Harvard and Chicago, becoming Canada's first federal Deputy Minister of Labour. As Prime Minister across three decades (1921–1930, 1935–1948), he reconciled French and English Canada through patient political compromise.

King navigated World War II with strategic mastery, expanding Canadian manufacturing, hosting the Quebec Conferences with Churchill and Roosevelt, and securing full sovereign equality via the Statute of Westminster (1931). He created old-age pensions and family allowances, shaping the modern Canadian welfare state.