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

Why did many nations resist napoleons rules

Brainliestttme : ) what economic changes occurred after world war ii? ( economic boom, baby boom, g.i. bill of rights)

An effect of the steamboat's popularity was that fewer people traveled by rail. o steam locomotives became less popular. people began to build canals in the united states and europe. o more people began to travel between the united states and europe.