Many American writers of the Romantic era created literary works celebrating the identity of America as a united and unified whole. What other trend emerged, that contradicted or opposed this "nationalism"?

socialism

loyalism

patriotism

sectionalism

Other trends which emerged that contradicted or opposed the concept of nationalism is patriotism (C).

Explanation:

This is because both of these terms are used as antonyms in nature. However, the actual meanings differ and are used in different contexts. Many American writers of the romantic era created literary works celebrating the identity of America as a united and unified whole. The trend of patriotism evolved and was often contradicted with the term nationalism in many contexts.

sectionalism

-Some Americans wanted to see the country establish a national identity that emphasized what made Americans the same while other Americans were more concerned with regional identities, such as "Southerners" and "New Englanders."