Historical clue formulations

• Things that are declared — 2020-04-24
• Group with five members in this puzzle, with "the" — 2018-06-03
• College students' declarations — 2016-07-04
• Big leagues — 2001-02-22
• Art and history, e.g. — 1997-07-11
• Ballplayer's goal, with "the" — 1996-01-04