Historical clue formulations

• Secretary of state during the Korean War — 2017-06-14
• Secretary of state before Dulles — 2014-08-08
• Dean of the Truman cabinet — 2012-11-03
• Truman's last secretary of state — 2008-07-23
• First of a railway trio — 2005-06-11
• Dean of diplomacy — 2003-06-01
• Dean of government — 2001-11-25