Why did populists want the united states to move from a currency backed by
gold to one backed by both gold and silver?

In 1893, the country was in thrown into a depression that lasted until roughly 1900 from the bursting of the railroad speculation bubble. Populists, who were primarily farmers, wanted to reinstate the system of bimetallism that had traditionally been in place in an effort to inflate the currency to provide them with more cash that could then be used to pay off their debts with cheaper dollars.So, It would increase the supply of money.

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it would increase the supply of money-Apex

Explanation:

on this day in 1833, president andrew jackson announces that the government will no longer use the second bank of the united states, the country's national bank. a national bank had first been created by george washington and alexander hamilton in 1791 to serve as a central repository for federal fund