Answer: Separation of power
Step-by-step explanation:
Each Consul could veto the action of the other. This is an example of the separation of powers in the United States. It is vital so that power won't be abused by anyone.
Separation of powers, tis the division of the responsibilities of the government into different branches so that there won't be a particular branch that holds too much power. It is also vital for checks and balances.