"He shall have dominion from sea to sea and from the river unto the ends of the earth (From Sea to sea) – Psalm 72:8 ". The first official use of this motto came in 1906 when it was engraved on the head of the mace of the Legislative Assembly of the new Province of Saskatchewan. The wording of the motto came to the attention of Sir Joseph Pope, then Under Secretary of State, who was impressed with its meaning. He later proposed it as motto for the new design of the coat of arms, which was approved by Order in Council on April 21, 1921 and by Royal Proclamation on November 21, 1921.
As new provinces entered Confederation, or when they received some mark of identification (sometimes taken from their seal), that mark was incorporated into the shield on the Canadian Red Ensign. By the turn of the century, the shield was made up of the coats of arms of the seven provinces then in Confederation.
In 1922, this unofficial version of the Canadian Red Ensign was changed by an Order in Council and the composite shield was replaced with the shield from the royal arms of Canada, more commonly known as the Canadian Coat of Arms. Two years later, this new version was approved for use on Canadian government buildings abroad. A similar order in 1945 authorized its use on federal buildings within Canada until a new national flag was adopted.