Materials used to build the Central Pacific Railroad were shipped across North America
Ofrom west to east
around South America.
from north to south.

answer; /// i believe that the correct answer is (divison of labor);

they bring people together to achieve control of the government

basically choosinng what sets in   congress and presdicny this is to keepthe antion hole and so it can last because wiht out authority it wouldnt last a week

the answer is moving from place to place