Historical clue formulations

• Regina's locale: Abbr. — 2014-04-23
• Prince Albert's home: Abbr. — 2011-06-05
• Its cap. is Regina — 2007-07-29
• N. Dak. neighbor — 2007-06-17
• Can. province — 2006-03-15
• Mont. neighbor — 2000-03-09
• Province north of Mont. — 1999-09-22
• Neighbor of Alta. — 1998-12-07
• It's between Alta. and Man. — 1994-11-07
• Alta. neighbor — 1994-01-13