The power of federal laws to supersede any state laws that conflict with them is established by which clause listed below found in the U. S. constitution, in Article Six, Clause 2? Select one:
A. Necessary and Proper Clause
B. Choice of Law Clause
C. Supremacy Clause
D. Commerce Clause

How did the percentage of americans living on farms change between 1820 and 1850 a. it lowered as many americans were sold into slavery b. it rated the same as people stopped coming to america c. it grew as more people came to america d. it lowered as many americans went to work in factories