What is populism and was it successful

Populism is a mode of political communication that appeals to the "common man," often contrasted with the enemy of the "privileged elite." Populism tends to be centrist on the traditional left–right political spectrum, as it sees both bourgeois capitalists and socialist organizers as having an unfair domination in the political sphere

The Populist Party was fairly successful for a period of time, and many of its ideas have been adopted as law. However, in 1896, when Populists gained control of the Democratic Party and William Jennings Bryan was nominated for election by both the independent Populist Party and the Democrats, it was his eventual defeat that drove many Populists to abandon them for Democratic or Republican ideals.
The silver issue was a major cause of the Populist Party's eventual downfall. Financial problems sent many Americans into panic when the value of silver dropped and then rose due to pressure from miners and farmers. Many people blamed the financial problems of the nation on the silver issue itself, while others blamed political parties. Bryan's election hung on the silver issue, and this was one of the main reasons for his eventual political downfall.

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Did not last long due to defeat of republicans, however somewhat successful because they left a legacy for hope and their fighting issues became reality in the future.