what does intentional trade have to do with canada's free trade history

2 answers

Do you mean international trade? Nearly all trade is intentional.
Read, read, read:

http://www.google.com/search?q=canadian+trade+policy+-+history&oq=canadian+trade+policy+-+history&aqs=chrome..69i57.8280j0j7&sourceid=chrome&es_sm=93&ie=UTF-8

This will give you several articles on the topic, some of which will explain the history of Canadian trade policies.