Which amendment forbids states from denying any person "life, liberty or property, without due process of law"?

The 14th Amendment is the correct choice because it explicitly includes the Due Process Clause, which states that no state shall deprive any person of "life, liberty, or property, without due process of law." This amendment was ratified in 1868 and was primarily aimed at protecting the rights of former slaves after the Civil War, as well as ensuring equal protection under the law for all citizens.

The significance of the 14th Amendment lies in its role in expanding civil rights and liberties. The Due Process Clause ensures that individuals cannot be subjected to arbitrary behavior by the state and must be afforded a fair legal process. This has profound implications in various fields such as criminal justice, education, and individual rights.

The other amendments listed do not contain provisions regarding due process in the same context. The 12th Amendment deals with the electoral process for the President and Vice President, the 13th Amendment prohibits slavery and involuntary servitude, while the 15th Amendment focuses on voting rights, specifically prohibiting the denial of the right to vote based on race or color. Each of these amendments addresses important issues, but none encompass the principles of due process as articulated in the 14th Amendment.