How did the environment of the Indus Valley river civilization differ from that of Mesopotamia and Egypt? What wasthe effect of this environmental difference

Unlike Mesopotamia and Ancient Egypt, the inhabitants of the Indus Valley Civilization did not build large, monumental structures. There is no conclusive evidence of palaces or temples—or even of kings, armies, or priests—and the largest structures may be granaries.

the constitution gives congress the power to regulate commerce "among" the several states.