<span>WILLIAM AND MARY (AND THEIR GLORIOUS REVOLUTION) they became the first monarchs to accept the limitations that parliament put upon them in a document that they wrote - their Bill of Rights</span>
Black codes were restrictive laws designed to limit the freedom of African Americans and ensure their availability as a cheap labor force after slavery was abolished during the Civil War.
The federal legislature or congress can repeal the state laws under the necessary and proper clause in order to impose federal laws necessary to provide general welfare and common defense of the nation because they have the authority to do so. This authority was given to them because the people believed that the congress would decide for the common good.
Moreover, only the federal legislature has the right to contract debts, lay taxes and if they believed that a state law may prevent the collection of a federal tax, then they can repeal state laws making sure that it is for the benefit of the United States.
It showed everyone inventions were imporant, it also made work so much easier instead of having to carry things, you could just use the pulley which was less strain on the human body and less chance someone could get hurt.
Im pretty sure its labor relations
hope this helps.
