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History rarely moves in straight lines; it moves in jumps, breaks, and inflection points. Looking back at the 20th century, years like 1933, 1968, and 1989 stand out as moments where long-developing trends coalesced into irreversible change.

History rarely moves in straight lines; it moves in jumps, breaks, and inflection points. Looking back at the 20th century, years like 1933, 1968, and 1989 stand out as moments where long-developing trends coalesced into irreversible change.