The Great Canadian flag debate (or Great Flag Debate) was a national debate that took place in 1963 and 1964 when a new design for the national flag of Canada was chosen. Although the flag debate had been going on for a long time prior, it officially began on June 15, 1964, when Prime Minister Lester B. Pearson proposed his plans for a new flag in the House of Commons. The debate lasted more than six months, bitterly dividing the people in the process. The debate over the proposed new Canadian flag was ended by closure on December 15, 1964. It resulted in the adoption of the "Maple Leaf" as the Canadian national flag.