What is the definition of Nationwide Experiments?

"Nationwide experiments" refers to a series of trials or investigations conducted across an entire country, like a grand, chaotic science fair where every state, province, and town gets to vote on the best experimental dish or the most effective new policy. Picture this: A nationwide experiment trying to figure out whether wearing neon socks makes people happier, only to find out that in one state, everyone's mood improved, while in another, it turned into a nationwide parade of confused, fluorescent-clad misfits.

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Edgy example sentence: "The nationwide experiments on 'positive vibes only' meditation apps just got a whole lot more serious: they started calling it 'Vibro-Crisis Prevention.'"