The U. S. Supreme Court ruled in the Slaughterhouse Cases that:

a. voting rights of African-Americans under the Fifteenth Amendment could not be abridged or denied by any state.
b. states could not interfere with vigorous federal enforcement of a broad array of civil rights guaranteed by the Fourteenth Amendment.
c. most rights of citizens were under the control of state governments rather than the federal government.
d. Reconstruction had progressed too far and was now officially ended.
e. the federal government had sole authority under the Commerce Clause to regulate the meatpacking industry.

c. most rights of citizens were under the control of state governments rather than the federal government.

Explanation:

The slaughter case is one of the historic case in the history of America. It took place in the year 1873.

It is basically a series of the Supreme court cases which rendered effectively of the 14th amendment which provided equal rights to all.

Even though the 14th amendment protected the equal rights of the blacks but it fails to provide the economic privileges which was guaranteed to them.

It also allowed the state legislatures to suspend all the blacks' legal as well as civil rights which is outlined in the Constitution. Thus it came under the control of the state government.

answer: stupidity. they should wait till they can get reward money.

answer:

d. because dr. laguardia selected a widely used measure, his study generalizes to has strong external validity. external validity has limited external validity. other applications of this measure.

the widely used measure that he applied to his experiment was the benton facial recognition test. it employed on to football players and as result, only players who suffered brain concussions did not pas this test. and although it has an external validity, it is limited because it isn't general to apply to other population.