What factors undermined social tolerance and democracy on the home front during WWI?

The US government put out propaganda to foster hatred and fear of the Germans.

Explanation:

Before the World War I, Germans were considered to be the largest non-English-speaking minority group in the U.S. and was the most studied modern foreign language in America

However, during World War I, it was reported that, there is an argument that if one learns German, one will become a German; a totalitarian in favor of the kaiser.

Hence, in an attempt of the US government to foster hatred and fear of the Germans, the German language was forbidden; the German-American press was heavily censored; German books were taken off the shelves; and German-American organizations were targeted, amongst many other social intolerance.

Therefore, the factors that undermined social tolerance and democracy on the home front during WWI, is that, the US government put out propaganda to foster hatred and fear of the Germans

the tariff was created to protect industry in the northern part of the united states. industries in the north were being driven out of business by imported goods that were priced at a low rate. the goal was to protect these industries   by taxing the goods.