ocr: Due to anada's size the EHEgEnce of a national economy has depended - on the development of an etticient system of transportation. The Trans-Canada Highway and two trans-continental rail systems are the focus ofroad and rail networks that reach into the far north. Air services are well-developed: and expanding. However, easy access to the cheap water transportation ofthe Great Lakes-Saint Lawrence Seaway system has helped Ontario and Québecretain their dominance of the economy.
