The cotton gin made cotton "king" and caused:
the cotton culture to move west
the decline of tobacco as a money crop
Southern farmers to raise a variety of crops
slaves to be less valuable in the South

The case was a u.s. supreme court decision that defined the scope of the u.s. congress's legislative power and how it relates to the powers of american state legislatures. the dispute in mcculloch involved the legality of the national bank and a tax that the state of maryland imposed on it.