Question

What 19th century construction projects provided the greatest boom to economic unification in both the U.S. and Canada?
a. The building of massive dams and hydroelectric projects
b. The building of telephone and telegraph systems
c. The building of transcontinental railroads
d. The building of highways and bridges

Answer 1

It would be "c. The building of transcontinental railroads" that provided the greatest boom to economic unification in both the U.S. and Canada, since this allowed for goods and services to be transported at unprecedented speeds and at much lower costs.