In the early 1790s, alexander hamilton wanted to create a national bank that could
hold money that belonged to private citizens.
issue a currency that could be used in every state.
issue different currencies for each state.
hold money that belonged to businesses.

He created the national bank so that he could issue a currency that could be used for all of the states. Before he creates the national bank, states would print their own currency. However, the price for each dollar varies in different state. This cause a major conflict within the US because Americans would have a hard time buying products with a different state currency. Which eventually lead to the popularity of using gold and silver as currency. But, if I were to have $100 New York money for example, how much does that actually worth? How much gold or silver can I exchange it for?

Because broadest terms allows the law flexibility depending on changing society and circumstances.