Historical clue formulations

• Where more than 60% of Fortune 500 companies are incorporated — 2024-05-16
• See 109-Across — 2016-11-20
• The Blue Hen State — 2016-01-12
• First Indian tribe to sign a treaty with the U.S. government — 2014-09-27
• State with just three counties — 2012-06-06
• - — 2006-05-14
• State nicknamed "Small Wonder" — 2004-10-06
• River that was notably crossed on Christmas 1776 — 2002-02-20
• Early admission? — 2001-03-10
• Trenton's river — 1998-08-13
• 17-Across crossed it — 1995-11-15