Well, so far, none of our Prime Ministers have gone to the General Assembly at the UN and called your President George W. Bush "the Devil'.
2006 Chávez speech at the United Nations - Wikipedia, the free encyclopedia

Also, there aren't quite as many Canadians that have taken a solumn vow to martyr themselves waging holy war against the American infidel.

Canadians speak the same language as Americans.

We live under a similar democratic system of government as Americans.

We have much the same culture as America.

We inherited the same legal system, the British Common Law, from Britain.

We practice the same major religions as Americans.

The Canadian military and coast guard regularily train with the American military and coast guard and those of other member countries of NATO. Our police forces and spy agencies share information with each other as well.

And there are literally millions of personal, professional and business relationships between the people and businesses in our two countries.

I could go on, but you can see why a state of friendship would normally be expected to arise between countries with so much in common and so many ties between them.