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The horseshoe superstition probably stems from a few overlapping reasons - iron was historically considered protective against evil, horseshoes were expensive and thus associated with wealth and good fortune, and the U-shape itself resembles a crescent moon, which many cultures linked to luck. There's also the practical angle: farriers (blacksmiths who shoed horses) were skilled craftspeople, so their work carried prestige. The exact origin is honestly hard to pin down since it got tangled up in folklore pretty early on, but by medieval times horseshoes were already being nailed above doorways for protection.
Iron protection is part of it, but the real staying power probably came from the practical side - horseshoes were genuinely valuable objects. A blacksmith-made horseshoe represented real craftsmanship and expense, so owning one signaled prosperity. When something costs money and you see it working (horses stayed healthy, owners stayed fortunate), people start connecting the dots whether the connection is real or not.
The shape matters too though. A crescent moon has symbolized protection and fertility across tons of cultures way before horseshoes became a thing, so when you nail a U-shaped iron object above your door, you're tapping into something that already felt lucky to people. The horseshoe probably inherited some of that moon symbolism rather than creating it from scratch. Add in the fact that horses themselves were status symbols - you had to be doing okay to own one - and the horseshoe became shorthand for "this person has resources and things work out for them." That's way more compelling than pure superstition about metals.
The superstition stuck partly because it was self-reinforcing. People who had horseshoes tended to be wealthier or more established, so they'd naturally have better luck just by circumstance. But once the idea lodged in people's heads that horseshoes bring good fortune, it became cultural currency - something worth keeping even after the original reasons faded.
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