How to create a blockchain snapshot for a hardfork?

How to create a blockchain snapshot for a hardfork?

I've done source forks (altcoins) and I understand how those work. But I'm a little stuck on how forks are activated? I need to know how blockchain snapshots are created and how the wallets know to distribute the initial fork offerings? If anyone could point me to a particular commit and/or PR of Bitcoin Cash or Gold where this logic is, I'd be very grateful.

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