The partition of Ireland, ca. 999,997,987 BC
The author (J.P. Mallory) and publisher (Thames & Hudson) begin their narrative in the deepest geological past, but the editing displays a delightful awareness of recent politics and history. The sub-section on the billion-year-old split of the earth's then single land mass is headed "Partition," for instance.
The next subsection, about the coming together of the two land masses that now form roughly the island's northwestern and southeastern halves is headed "The unification of Ireland."
No other headings that I can find display similar cheek, though I suspect that some observers of the Ireland of recent decades could have fun with "Age of dinosaurs."
© Peter Rozovsky 2015