Historical clue formulations

• Klondike territory — 2026-06-25
• River to the Bering Sea — 2019-07-04
• Its capital is Whitehorse — 2016-06-19
• Territory east of Alaska — 2014-09-16
• Home to nearly 600 miles of the Alaska Highway — 2012-05-09
• The Last Frontier stream — 2007-10-14
• 1890's gold rush destination — 2005-08-22
• Gold rush territory — 2004-02-18
• Sgt. Preston's beat — 1999-08-04
• Sgt. Preston's home — 1998-07-08
• Alaskan river — 1994-05-30