Individuals were cut off from gold in 1933, Nixon closed off domestic banks and other national reserve banks when he was in office. Honestly, there wasn't much of a choice because the dollar was worth a lot less than the gold and silver that the US claimed they would redeem it for. Basically, other reserve banks were making a run at the US treasury because they knew the Fed didn't have enough gold and silver to back up all the notes they'd printed.
In theory, Nixon could have slowed down redemptions, drastically cut spending, and started purchasing crazy amounts of gold and silver. And setting off a massive depression. I doubt anyone seriously considered that option.
Only because he was weak. He should have hauled in everyone who was involved in printing currency that exceeded the precious metals behind it and started trying them for theft.
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