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FDR in effect broke the gold standard in two ways:

1) First since gold was illegal to own, Federal notes were effectively no longer redeemable for gold

2) The dollar was inflated from $20.67/oz to $35/oz

This meant two things; first the dollar was backed in gold by name only since you couldn't actually take advantage of that fact in any quantity. Second the Government was able to change the dollar/gold ratio at its whim. This breach of trust meant that the dollar was not and would never again be as good as actual gold.