Which of these factors contributed most to US westward expansion in the second half of the nineteenth century?

A.
improved overland trails
B.
development of more railroad systems
C.
peace treaties with American Indians
D.
discovery of gold in Alaska

Iam not here to cheat, i just need to check my answer. how were incan commoners grouped within their social class? a. by gender and age b. by family rank c. by wealth and status d. by religious worship my answer is c. i believe this because slaves are at the bottom of the rank, whilst the emperor is above all.

Which events are correlated but do not necessarily have a causal relationship?

Which of the following would an isolationist support?