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.
All people believe in different things Budeh, Jesus, god,you name it. People have their rights to worship or praise it.
Span of control means that each individual will be assigned to only one supervisor. Hope this helped :)
