The reasons for the fall of Hindu valley civilization include,
1. Tectonic uplifts and earth quakes.
2. recurring floods.
3. There was decrease in trade.
4. Aryan invasions.
The valley of civilization was destroyed by regular floods in the area. Aryan did not knew anything to do with urban areas they were used to live in villages.
Indu valley civilization was advanced because it had modern cities which are Mohenjo-Daro and Harappa and it was modern which founded in Pakistan.
Supremacy Clause is the cause of Constitution that resolves conflicts between state law and national law. It is important because it affirms that the Constitution is the supreme law of the land.
Explanation: Phrenologists were largely pseudo scientists who attempted to establish a biological basis for differences between the races. This burgeoning science was used to buttress theories of racial inferiority.
