discuss the extent that available means of transportation determined the spatial structure and development of cities (urban areas) over historical time. include in your discusson:
a. the 1700 - 1850 time period when transportation was limited to walking, horse-drawn carriages, and ships.
b. The 1870 - 1910 time period when transportation included railroads and electric street trolleys
c. the 20th century with the advent of the automobile.