How did physical geography affect the development of Indus Valley civilizations ?

Because of the drier land area, Ancient Indians were forced to irrigate to obtain the needed stock of food to distribute among their peoples, much less a emergency surplus. The last major geographical feature was the Khyber Pass -- the only easily traversed path connecting Asia and India near Kabul.

Explanation:

the american rail road was the most influential and useful transportation system developed in the 1800's with steam locomotives and in the very late 1800's and early 1900's diesel electric locomotives being used to transport goods and people around the newly expanded united states!