On Dec 15, 1791 the Bill of Rights was ratified and became a part of the US Constitution.
A specific shout out to the first one of these...
Amendment I - Freedom of Religion, Press, Expression. Ratified 12/15/1791. Note
Congress shall make no law respecting an establishment of religion, or prohibiting the free exercise thereof; or abridging the freedom of speech, or of the press; or the right of the people peaceably to assemble, and to petition the Government for a redress of grievances.
Thank you to Virginia and a big ol' screw you to Massachusetts (March 2, 1939), Georgia (March 18, 1939), and Connecticut (April 19, 1939).
Okay, I seem to remember an interesting story behind those late dates for the last three there but it is late, it is past my bedtime, and I am going to bed.