Construction began in 1910 and was completed in 1914. under the hay-bunau-varilla treaty, america was granted the right to supervise the construction and operation of the project. greatly reduced the time needed for ships to travel between the atlantic and pacific ocean. this list of notes would be most valuable to a student writing a report about a) the erie canal. b) the panama canal. c) the transcontinental railroad. d) the interstate highway system.