Answer:
Treaty of Guadalupe Hidalgo
Explanation:
The completion of the first transcontinental railroad in 1869 encouraged settlement of the American west by proving easier travel and it took less time.
By helping each other get through and meet each other helped one another to pass the cold war
The articles created a very losely based country that would not survie
also the states were in full control and they would not pay the federal goverment taxes which would have left the goverment broke