Answer:
They thought it was unnecessary because the constitution would already limit government powers
Step-by-step explanation:
During the debates for the ratification of the Constitution (1787), the Federalists argued that it was unnecessary to add a list of rights because the Constitution set a structure of government based on the principles of Separation of Powers and the Checks and Balances that already provided limitations to the government.
Under this system, the government had to be divided into three branches and each branch had the authority to respond to the action of the other, as well as to oversee, check and limit the other.