During the mid-19th century, there was a policy disagreement between the British and the colonial governments. The British wanted all the colonies to continue to use sterling, to facilitate trade within the Empire. The Canadian colonies, both in the east and British Columbia, increasingly favoured linking their currencies to the US dollar, given the strong local trade links. Eventually, the local trade won out and the Canadian colonies migrated to currencies linked to the US dollar.
when did canada change from pounds to dollars
the mid-19th century