"Steam engine" is the one invention among the choices given in the question that <span>was the basis for the major developments in American transportation. The correct option among all the options that are given in the question is the first option or option "a". I hope that this is the answer that has come to your help.</span>
A region is an area that includes a number of places--all of which have something in common. Geographers categorize regions in two basic ways: physical and cultural. Physical regions are defined by landform (continents and mountain ranges), climate, soil, and natural vegetation.
The printing press did not appear until 150 years.