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:

worcester v. georgia, legal case in which the u.s. supreme court on march 3, 1832, held (5–1) that the states did not have the right to impose regulations on native american land. andrew jackson refused to enforce the ruling, the decision form the basis for most subsequent indian law in the united states.