The most significant obstacle in building the transcontinental railroad was
a) crossing the appalachian mountains.
b) laying track across the great plains.
c) removing hostile native americans from the region.
d) crossing the sierra nevada range and the rocky mountains.

Who were the people that migrated south into india and indus valley

The constitution limits the power of question 3 options: both the federal government and state governments only the federal government only state governments the supreme court

Why was the scientific method considered to be a major contribution during the scientific revolution? a) the scientific method proved religion was wrong. b) the scientific method proved religion was correct. eliminate c) the scientific method established a systematic way to find proof using reason. d) the scientific method established a systematic way to find reason without proof.