is in custody for an act done or omitted under any alleged right, title, authority, privilege, protection, or exemption claimed under the commission, order or sanction of any foreign state, or under color thereof, the validity and effect of which depend upon the law of nations; or It is necessary to bring said persons into court to testify or for trial. In 1950s and 1960s, decisions by the Warren Court greatly expanded the use and scope of the federal writ largely due to the "constitutionalizing" of criminal procedure by applying the Bill of Rights, in part, to state courts using the incorporation doctrine. This afforded state prisoners many more opportunities to claim that their convictions were unconstitutional, which provided grounds for habeas corpus relief. In the last thirty years, decisions by the Burger and Rehnquist Courts have somewhat narrowed the writ. The Antiterrorism and Effective Death Penalty Act of 1996 (AEDPA) further limited the use of the federal writ by imposing a one-year statute of limitations and dramatically increasing the federal judiciary's deference to decisions previously made in state court proceedings either on appeal or in a state court habeas corpus action. One of AEDPA's most controversial changes is the requirement that any constitutional right invoked to vacate a state court conviction rooted in a mistake of law by the state court must have "resulted in a decision that was contrary to, or involved an unreasonable application of, clearly established Federal law, as determined by the Supreme Court of the United States" (emphasis added). Thus, a U.S. Court of Appeals must ignore its own precedents and affirm a state court decision contrary to its precedents, if the U.S. Supreme Court has never squarely addressed a particular issue of federal law. Suspension during the Civil War Presidential suspension of habeas corpus On April 27, 1861, the right of habeas corpus was unilaterally suspended by President Abraham Lincoln in Maryland during the American Civil War. Lincoln had received word that anti-war Maryland officials intended to destroy the railroad tracks between Annapolis and Philadelphia, which was a vital supply line for the army preparing to fight the South. Indeed, soon after, the Maryland legislature would simultaneously vote to stay in the Union and to close these rail lines, in an apparent effort to prevent war between its northern and southern neighbors. Lincoln did not issue a sweeping order; it only applied to the