why was it critical for good pioneer trails going west to have a decent route through the Rocky mountains

What was unification difficult to accomplish in both germany and italy? a.) weaker states we’re attacked by stronger states for control of the emerging nations. b.) major european powers fought to keep independent states under their control. c.) germans and italians did not share common histories and languages.

What two advances did europeans borrowed from china

What is the name of the social stratification set up by the vedic peoples of the indus river valley civilization