What are three important things that William Lyon Mackenzie king did?

William Lyon Mackenzie King, Canada's longest-serving prime minister, played a pivotal role during World War II, leading the country through the conflict and establishing a strong wartime economy. He also championed social welfare programs, laying the groundwork for Canada's modern social safety net, including the establishment of unemployment insurance. Additionally, King was instrumental in the development of Canada's national identity, advocating for greater autonomy from Britain and promoting Canadian nationalism.