A local attorney named David McConaughy started buying up the battlefield at Gettysburg in July 1863 -- the same month the fighting happened, more than a year and a half before the Civil War ended. That single fact does more to explain why Gettysburg still matters than the battle's casualty count does. Most historic sites are remembered once, then slowly forgotten as living memory of them fades -- verbatim detail decaying while nothing replaces it. Gettysburg didn't get remembered once. It got re-activated, on purpose, by a different generation with a different reason every few decades: preserved as raw ground within weeks of the fighting, redefined by a 272-word speech four months later, formalized as a National Military Park in 1895, and repurposed by a sitting president as a literal Cold War negotiating table in 1959. It isn't one memory that has lasted 162 years. It's at least three, stacked, each one giving a new generation its own real reason to keep showing up -- and the honest complication is that visitation has fallen 86% since 1970 and is still declining, with real, measured evidence that a meaningful share of Americans no longer know why, or even which war it was. Whether a fourth reactivation is still coming, or whether the pattern has simply run its course, is the real open question this piece ends on rather than resolves.