Alexander Hamilton is considered as one the most important Founding Father of the U.s. Hamilton had an important influence on multiple aspects in the U.S. government including the Constitution, the financial system and the economic policies during Washington's administration from 1732 to 1799. Indeed Alexander Hamilton became the first secretary of the treasury in 1789 and during his administration, Hamilton pioneered the idea of a national system of banking based on the system of banking in England, except that the bank system proposed by Hamilton excluded the government from the public debt. Besides in 1792, Hamilton proposed the Mint act that established the United States dollar as the unit of money for the nation, which also supported the idea of a national system of banking. Thus, the man that proposed the national system of banking and was responsible for the mint act of 1792 was Alexander Hamilton.
They thought it was necessary because they had to check and make sure each branch doesn't go over their limit of power. I hope that answers your question.
