read
http://www.can-am.gc.ca/menu-e.asp
"The United States sells more than twice as many goods to Canada, a market of 30 million people, as to Japan, a market of over 125 million. Canada is a larger market for US goods than all 15 members of the European Union combined."
"The United States is the largest foreign investor in Canada and the most popular destination for Canadian investment. "
So who needs who again?