Many anti-imperialists worried that

imperialism might threaten the American democratic

system. How might this happen?.

The anti-imperialist believed that might happen because they were aware of the fact that imperialism is aggressive and paves the way not for a natural democracy but for a forceful democracy.

Explanation:

The anti-imperialists were concerned that adopting imperialism to extend the boundaries of the nation would harm the country internally. They believed that imperialism was not an acceptable form of governance as it is aggressive in nature and harmful to the natural structure of democracy.