Which was a key to writing and ratifying in the u. s constitution?

Getting 9/13 states to ratify it.
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The Constitution was a document that was written with a variety of factors, perspectives, and desires. Because of all these factors, it was critical that both parties involved could compromise on issues. So, the answer is probably willingness to compromise on all sides.

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.