The united states constitution delegates police powers mainly to

a. state and local authorities.
b. the national guard.
c. the president of the united states.
d. congress.

9) a & b

10) true.

11) false.

12) false.

13) true.

14) false.

15) true.

16) true.

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industry had made the u.s. the richest nation in the world at this time. the second industrial revolution caused growth in industry and transportation, which allowed increased trade between nations.