Because it is a constitutional monarchy rather than a republic
The president of the United States is Trump and the United States doesn't have prime ministers . Several nations do have prime ministers, but we need the name of the country to tell his/her name.
In countries with a parliamentary system of government, like Canada, the prime minister is the chief executive.
America has a presidential system and Canada has parliamentary government system. America elects their president, while in Canada the Prime Minister leads the party that receives the most votes.
No president in Canada.
No president in Canada.
There was no president in Canada.
Canada has no president.
No president in Canada.
No president in Canada.
No president in Canada.
There was no president in Canada.
No president in Canada.