- Irish Americans: A significant portion of Irish Americans held anti-British sentiments due to historical grievances related to British rule in Ireland. Some Irish Americans saw Germany as a potential ally against the British Empire and supported the Central Powers.
- Socialists: Some socialist groups in the United States were opposed to capitalism and imperialism. They saw World War I as a conflict between capitalist powers and believed that a victory for the Central Powers would lead to a more progressive and socialist world.
- Pacifists: Certain pacifist groups in the United States opposed U.S. intervention in World War I on moral and humanitarian grounds. They argued that the war was unnecessary and would only lead to further bloodshed and suffering.
- Business Interests: Some American businesses had significant investments and financial ties to Germany and the Central Powers. These businesses feared that a victory by the Allied Powers would disrupt their economic interests and potentially lead to financial losses.