What makes these so lengthy? One example is [Maastricht Treaty](https://en.wikipedia.org/wiki/Maastricht_Treaty) (signed in 1992 that forms the basis of today’s European union) which is hundreds, if not thousands of pages long.
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Because everyone involved has lots and lots of “yeah, but *what if…*”s that need to be specifically addressed. Otherwise a situation could come up in the future that’s unclear, and that could become messy.
As the number of signatories grows, the number of “what if”s that need to be clarified grows, and the more specific they need to be.
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