What document gives the government its power on behalf of the people?

The Constitution

Constitution

Explanation:

Government  receives  its power  from the people

You can thank me if you want. If you don't its okay. I am glad you have still learned something :D

answer; people where able to travel across the u.s.a faster than any other mode of transportation,travel time was about a week,from coast to coast

congress also has implied powers, which derive from the necessary and proper clause of the constitution and permit congress "to make all laws which shall be necessary and proper for carrying into execution the foregoing powers, and all other powers vested by this constitution in the government of the united states.