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

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

Explanation:

The Slaughter-House Cases was a landmark decision of the United States' Supreme Court where the court ruled out that the 'privilege and the immunities' as given by the 14th Amendment of the US Constitution are for the federal US citizenship and not for the state citizenship.

It also said that the most of the rights of the people of America are under the control of the State government and not wit the federal government.

the second significant cause of the great migration was the desire of black southerners to escape segregation, known euphemistically as jim crow. rural african american southerners believed that segregation - and racism and prejudice against blacks - was significantly less intense in the north.

b)

it created free trade throughout the colonial territories.