Related Clues:

• Time span
• 1970's-80's cause
• Slice of history
• Period
• Brand at the laundromat
• Roaring Twenties, e.g.
• Time period
• Stretch of history
• Part of B.C.E.
• The Thatcher years, e.g., in Britain
• Common-interest group
• Conservatives or liberals, say, in the Senate
• Laundry detergent brand
• Historic time
• See 30-Across