Answer:
recruitment and supply of native military allies; regulation of trade and diplomacy; and protection of native peoples' territorial integrity through negotiated settlement boundary lines.
Explanation:
The continental divide is the geographic feature located in the Rocky mountains. It determines the directional flow of rivers in North America and it follows at a high elevation.
I want to say it is either the second or third answer, most likely the second. From what I remember learning in class is that they were building a winding railroad to California.
the answer is 1865. hope this helped! (: