How did the United States government enforce conformity among American citizens during World War I?

The years surrounding America’s involvement in World War I were a watershed for how the United States treated foreigners within its borders during wartime. Immigrants had flooded the United States in the late 19th and early 20th centuries. When the United States declared war on Germany on April 6, 1917, almost a third of Americans were either first or second-generation immigrants. Those born in Germany and even American-born citizens of German descent fell under suspicion of being disloyal.

Explanation:

in 1891, the people's party (also known as the populist party, or the populists) was formed as a political party representing the interests of the nation's agricultural sector. the farmer's alliance was a major part of the populist coalition.