Related Clues:

• #MeToo and Progressive
• Periods of historical significance
• History class units
• Periods that might be associated with heads of state
• Baseball stats that are better when lower
• Periods often named for presidents
• Museum sections, perhaps
• Iconic times
• Concealed by opera star in The Times
• History book sections
• Past periods
• Swing and Jazz
• Big band and disco, in music history
• Time line segments
• History syllabus units