Developments in which of these industries made important contributions to improvements in the transportation system in the united states during the second half of the 19th century? petroleum steel mining aviation

How did the new working class of the industrial revolution differ from the working classes of the earlier, farm based economy?

What religion influenced the first persian empire as established by cuyrus the great?

How did the construction of the erie canal improve transportation in the united states in the 1820s? a. the canal connected the great lakes to the mississippi river. b. the canal connected the great lakes to the ohio river. c. the canal connected the atlantic and pacific oceans. d. the canal connected the great lakes to the atlantic ocean.