The term "Red Ensign" is often used to refer to the Canadian Red Ensign, the former "de facto" national flag of Canada. It was informally adopted following Canadian Confederation in 1867 and, from 1892, it was the official flag for use on Canadian merchant ships. On land, however, the official national flag was the Union Flag. Despite its unofficial status, the Red Ensign was widely used on land as well. In 1924, the Red Ensign was approved for use on Canadian government buildings outside Canada, and from 1945 for those inside Canada as well.