Leslie Frost became Premier of Ontario in May, 1949, and led the province during a significant era of economic growth following the Second World War.

Agnes Macphail - one of Ontario's first two women MPPs - became the first woman in the province’s history to chair a meeting of the Legislative Assembly on March 1st, 1951. 

Premier Frost breaks ground on the University Avenue TTC subway extension. During construction, a tunnel was carved underneath the Legislative Building and Queen’s Park. This subway extension opened in 1963.

The Red Ensign carrying the shield of arms of Ontario is confirmed as the province’s official flag in April, 1965.