Twenty years later, the Federal District Commission and Prime Minister Mackenzie King urged the federal government to acquire land, which eventually led to the creation of Confederation Square. In 1939, King invited Jacques Gréber to create a master plan for the city. This plan proposed new parkways along the Ottawa and Rideau Rivers, included the idea for the Greenbelt, and urged the need for a ceremonial route to Parliament but the plan was not approved until 1951 by the government of Louis St. Laurent. Gréber's Plan has mostly been implemented and still affects the city today.