Final answer:
The 14th amendment granted federal citizenship, equal protection, and prevented deprivation of rights without due process.
Step-by-step explanation:
The 14th amendment to the Constitution had the greatest impact of the 'Civil War Amendment' because it granted federal citizenship to all persons born or naturalized in the United States. It also provided equal protection under both state and federal law and prohibited states from depriving their residents of life, liberty, or property without a legal proceeding. This amendment played a significant role in expanding civil rights and ensuring equal treatment for all citizens.
Learn more about The 14th Amendment and its impact