The Bureau of Indian Affairs is the answer
Which is based on the Supremacy Clause, federal law preempts state law, even when the laws conflict. Thus, a federal court may require a state to stop certain behavior it believes interferes with, or is in conflict with, federal law.
The answer is "C" the raising of tariffs in different countries throughout the world led to a restriction of trade.
A
Explaination::
For higher crop productivy; decreased use of water and fertillizer