What 19th century inventions probably most improved transportation in the united stated ? why ?

In the mid 1800s western settlers and american indians differed in their views about

Which best expresses the radical republican philosophy of reconstruction? a. the confederate states were conquered territories that should be ruled by military governors. b. the southern states actually never left the union. c. if ten percent of the voters of a state that had seceded took an oath of allegiance to the union, then it should be readmitted as a state.

17 points! ! (explain your answer)