Why was the journey of the Oregon used to support the idea of a canal across Central America?

The Oregon could have made its journey much more quickly using a canal.

The Oregon Trail was used by emigrants from the East to venture a new life into the West. Thier belief that in the West lies their future is what kept them going on this trail. Harsh weather conditions, long days of walking, and exposure to different elements made the traverse along this trails so much harder. The idea of building a canal opened a lot of opportunities not only for these emigrants but also for the government. It allowed for better transportation and communication, especially during the Civil War. The story of the Oregon traverse is a monumental feat of linking the East to the West making a cultural impact on America.