1. **Sir John A. Macdonald:** Canada's first Prime Minister, Sir John A. Macdonald, played a pivotal role in the country's Confederation in 1867. He was a key figure in shaping Canada's early political landscape and establishing the transcontinental Canadian Pacific Railway.
2. **William Lyon Mackenzie King:** As Canada's longest-serving Prime Minister, Mackenzie King led the country for a total of 22 years during the 20th century. His leadership included guiding Canada through both World Wars and implementing significant social and economic policies.
3. **Pierre Elliott Trudeau:** Pierre Trudeau, the 15th Prime Minister of Canada, is known for his contributions to Canadian politics during the late 20th century. He introduced the Charter of Rights and Freedoms and emphasized bilingualism and multiculturalism.
4. **Tommy Douglas:** Although not a Prime Minister, Tommy Douglas was a pioneering political leader and the driving force behind the implementation of universal healthcare in Canada. He served as Premier of Saskatchewan and is often referred to as the "father of Medicare."
5. **Jean Chrétien:** Jean Chrétien was Canada's 20th Prime Minister and held office from 1993 to 2003. His leadership saw Canada navigate important international events, such as the Kosovo conflict and the signing of the Kyoto Protocol.
These leaders have had a lasting impact on Canada's political landscape, governance, and societal values. Their contributions have helped shape the modern Canadian nation.