--- title: Triple Crown Winners: Why Do They Seem to Come in Clusters? description: The 1930s, 1940s and 1970s were boom times for racing canonical: https://time.com/3901397/triple-crown-history/ author: Lily Rothman article:opinion: false article:content_tier: free article:published_time: 2015-06-05T15:00:09.000Z article:modified_time: 2026-08-04T07:59:05.690Z article:section: History og:title: Triple Crown Winners: Why Do They Seem to Come in Clusters? og:description: The 1930s, 1940s and 1970s were boom times for racing og:url: https://time.com/3901397/triple-crown-history/ og:site_name: TIME og:image: https://static.time.com/v3/assets/bltea6093859af6183b/blt214a6b854856561b/6988522fcd1bba41f76fb8e6/affirmed.jpeg?branch=production&width=1200&quality=75&auto=webp&crop=16:9 og:image:width: 1200 og:image:height: 675 og:image:alt: 1978 Belmont Stakes og:type: article twitter:card: summary_large_image twitter:title: Triple Crown Winners: Why Do They Seem to Come in Clusters? twitter:description: The 1930s, 1940s and 1970s were boom times for racing twitter:image: https://static.time.com/v3/assets/bltea6093859af6183b/blt214a6b854856561b/6988522fcd1bba41f76fb8e6/affirmed.jpeg?branch=production&width=1200&quality=75&auto=webp&crop=16:9 ---  # Why It Seems Like Triple Crown Victories Cluster Together > Sponsored content. 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They are at time.com/newsletters and are separate from a paid subscription. ## Video: Know Right Now: American Pharaoh Sets Sights on Triple Crown [Watch (HLS stream): Know Right Now: American Pharaoh Sets Sights on Triple Crown](https://cdn.jwplayer.com/manifests/vgBTAhhZ.m3u8) (1:01)  _Published 2015-06-02. American Pharaoh is looking to clinch the first Triple Crown win since 1978._  by [Lily Rothman](https://time.com/author/lily-rothman/)  ## Lily Rothman Rothman is managing editor at TIME. Jun 5, 2015 3:00 PM UTC  Jockey Steve Cauthen rides Affirmed #3 as Jorge Velasquez tries to pull Alydar #2 into first place during the Belmont Stakes on June 10, 1978, at Belmont Park in Elmont, N.Y. Jockey Steve Cauthen rides Affirmed #3 as Jorge Velasquez tries to pull Alydar #2 into first place during the Belmont Stakes on June 10, 1978, at Belmont Park in Elmont, N.Y. Robert Riger—Getty Images  by [Lily Rothman](https://time.com/author/lily-rothman/)  ## Lily Rothman Rothman is managing editor at TIME. Jun 5, 2015 3:00 PM UTC Look at a list of past Triple Crown winners and something is immediately obvious: it’s been nearly a century since the trio of races—the Kentucky Derby, the Preakness and the Belmont Stakes—were lumped together under that name, and the horses who have won are lumped together too. The 1930s saw three winners; the 1940s had four, and there were three in the 1970s. The only outlier was in 1919, before the three races were widely known as the Triple Crown. If American Pharoah takes the title at Belmont on Saturday, he will be the first winner of all three in 37 years. So why does it seem like certain decades produce great Triple Crown horses and others fall flat? TIME [asked](http://time.com/vault/issue/1979-06-11/page/62/) just that same question in 1979, the year after Affirmed took the elusive title: --- > “” --- The answer, it turned out, was an unsatisfying one: winning streaks are mostly luck. Why do we think otherwise? Blame a concept familiar to statisticians and gamblers: the clustering illusion, which is the human tendency to see streaks as significant, whereas in reality any series of events is likely to contain its fair share of clusters. Though horse racing is not actually random in the way a coin toss is, the analogy holds up: one [study](http://cs.bc.edu/~straubin/cs244-2015/hothands.pdf) about streaks in basketball, a similarly talent-based activity, found that perceived hot streaks or cold streaks were pretty much just in the players’ and fans’ imaginations. Sure, some factors were under human control. The top sires of the 1970s, like Bold Ruler, whose descendants included both Secretariat and Seattle Slew, were being made more available to a greater number of mares, creating a stronger pool. Still, racing magnate Alfred Gwynne Vanderbilt told TIME that those were probably not the deciding factors. “I can’t think of any logical reason for more Triple Crown horses lately,” he said. “And if we do get a third in a row this year, I think it’s mostly chance.” As it turned out, Spectacular Bid’s luck had run out. Same for every horse that followed in his footsteps. We’ll see if that holds for another year. **_Read the full story from 1979, here in the TIME Vault:_** [Riddle of the Triple Crown](http://time.com/vault/issue/1979-06-11/page/62/) ## Transcript [ MUSIC ] American Pharoah and Victor Esperosa has won the Kentucky Derby! 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