Question

why it has been difficult to develop surface transport in south america​

Answer 1

Transportation

In an area the size of South America, an efficient system of transportation is necessary for the development of the hinterland, the expansion of national markets, and the integration of the different national economic systems. Unlike North America, South America still does not have an adequately integrated transportation network. Significant efforts have been made to improve both the connections within countries and the linkages between them.