Idon't know the answers to these questions. i answered the others but need with these 5. question 1 which transportation development had the greatest long-term impact on the american economy? steamboat canal system horse-drawn cart steam locomotive question 2 improvements in transportation led to lower shipping costs for goods fewer settlers moving westward increased communication times higher prices for empty lands question 3 americans remember robert fulton for building a workable horse-drawn cart canal system locomotive steamboat question 4 maryland and illinois were connected through the u. s. national railroad u. s. national skyway u. s. national canal u. s. national road question 5 most workers for the central pacific railroad were irish french german chinese