Final answer:
The Grand Trunk Railway primarily operated East to West in Canada, aiding in the country's settlement, development, and defense against potential invasions.
Step-by-step explanation:
The Grand Trunk Railway primarily traveled East to West Canada, forming a critical part of Canada's transportation infrastructure and facilitating the settlement and development of the country. The construction of transcontinental railways like the Canadian Pacific Railroad played a vital role in Canada's journey to becoming a united and independent nation, as outlined in the British North American Act of 1867. While also connecting to cities in the United States, the grand vision of railways like the Grand Trunk was to bind together the far-flung regions of Canada, encouraging growth and helping to protect against the threats posed by potential invasions.