Why did the Grange
promote regulation of railroad and warehouse
rates and operations?

just finished this it is b. centrifugal force

powers  are  denied  to the  national governmentin three distinct ways: some  powers, such as the  power  to levy duties on exports or prohibit the freedom of religion, speech, press, or assembly, are expressly  denied  to the  national government  in the  constitution.

which statement explains one of the reasons world war 1 was so much more destructive than earlier conflicts