The answer is paleo indians
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.
Answer:
a because nazi would catch them and put them in boot camps
Explanation:
I think
A plateau is B - a large, raised area of mostly level land. :^)
