The US currency went off the gold standard.
The Great Depression was causing people to hoard gold. So using gold to back the dollar was no longer feasible because gold was untenable. Franklin Roosevelt made the decision to take the US off of gold.
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Answer:
"In the nineteenth century in Europe, a handful of ideologies came to predominate: conservatism, nationalism, liberalism, and socialism. In turn, briefly put, three of those ideologies had one thing in common: they opposed the fourth."
Yes they actually did.......for some odd reason