when were bill of rights added to constitution
December 15, 1791
United States Bill of Rights
 Articles Three through Twelve were ratified as additions to the Constitution on December 15, 1791, and became Amendments One through Ten of the Constitution. Article Two became part of the Constitution on May 5, 1992, as the Twenty-seventh Amendment. Article One is still pending before the states.

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United States Bill of Rights [SEP] Introduction
Article Two became part of the Constitution on May 5, 1992, as the Twenty-seventh Amendment. Article One is still pending before the states. Although Madison's proposed amendments included a provision to extend the protection of some of the Bill of Rights to the states, the amendments that were finally submitted for ratification applied only to the federal government. The door for their application upon state governments was opened in the 1860s, following ratification of the Fourteenth Amendment. Since the early 20th century both federal and state courts have used the Fourteenth Amendment to apply portions of the Bill of Rights to state and local governments.