Answer
The Fourteenth Amendment
Step-by-step explanation
The bill of right serves to protect citizens from excess government power. By achieving this it ensures that there is separation of powers between different government branches that is the judiciary, the executive and the legislature.
The fourteenth amendment reads that all persons born in the United states of America or naturalized which includes the slaves who had been set free after the civil war that no state shall enforce any law which shall a bridge the privileges or immunities of citizens of the United States.No state should deprive any person or of life,liberty or property without the due process of the law, nor deny to any person within its jurisdiction the equal protection of the law.
Generally the 14th Amendment serves a very important purpose of defining what it means to be a United States citizen and protects certain rights of the people.