What date was the amendment adopted to the constitution that was central to the Supreme Court case California Democratic Party v. Jones
California Democratic Party v. Jones: California Democratic Party v. Jones, 530 U.S. 567 (2000), was a case in which the United States Supreme Court held that California's blanket primary violates a political party's First Amendment freedom of association. First Amendment to the United States Constitution:  It was adopted on December 15, 1791, as one of the ten amendments that constitute the Bill of Rights.
December 15, 1791