This what i found hope this helped. if not let me know
The answer is b. secede from the union.
A. it took a few decades. The court ruled that even if they are separate, as long as they are equal, it was okay.
Interchangeable parts- are parts inside of a product that can be replaced individually, without having to replace the entire product
Assembly Line- is the concept of having workers lined up in a "row" and repeatedly do the same job the entire time. this helped with time consumption and made factorial processes much easier